Operation ALL have the ALL (CORE)? term... form where term is a word or a phrase taken into double or single quotes. Operation return just those posts which contain all specified terms. Presense of optional modifier CORE will mean that only "important" post words should be considered. Operation name declaration is optional in absense of CORE modifier. If enter only search terms then Search Engine will "guess" that word ALL is assumed at the beginning. Search is performed with no respect to character case, this why fly Moon and fly moon searches give the same result. Search is performed with no respect to word forms as well, so tournament winner and tournaments winners searches are identical. When you search for phrases, Search Engine will display only those posts which have no punctuation marks between words inside a phrase being searched. There is a difference between taking search phrases into single or double quotes. When phrase is double quoted then words should appear in posts in exactly same form to be found. When phrase is single quoted then word form is not taken into account. So 'space shuttle' will find all 3 phrases:
... the space shuttle Atlantis ... all space shuttles ... space shuttle's fuel tank ...
while "space shuttle" will find only the first phrase. Quoted phrase will match to post in presense of CORE modifier if at least one word contained in phrase belong to set of "important" post words.

Operation ANY have the ANY (CORE)? (number)? term... form and differs from ALL with one thing - it find posts containing some of listed terms in quantity not less than specified (1 by default).

Operation URL have the URL source url... form and return posts from sources specified.

Operation SITE have the SITE source site... form and return posts from sources belonging to sites specified.

Operation AND have the search expression AND search expression form and return posts which have been found for left and right search expressions simultaneously.

Operation OR have the search expression OR search expression form and return posts which have been found for left or right search expression.

Operation EXCEPT have the search expression EXCEPT search expression form and return just those posts which have been found for left search expression but not for the right one.

Operation DATE have the 2 forms: search expression DATE time and search expression DATE BEFORE time. First form return only those posts which were found for the search expression on the left and published not earlier than specified time. The second - those which were found for expression on the left and published earlier than specified time. Time should be expressed in any of forms descibed below.

Operation COUNTRY have 2 forms: search expression COUNTRY country code... and search expression COUNTRY NOT country code.... First form return only those posts which where found for the search expression on the left and published with a source from one of countries listed on the right. The second - those which were found for expression on the left and published by a source not from any of countries listed on the right.

Operation DOMAIN also have 2 forms: search expression DOMAIN internet-domain... and search expression DOMAIN NOT internet-domain.... First form return only those posts which were found for the search expression on the left and published with a source in one of listed on the right domains. The second - those which were found for expression on the left and published by a source not belonging to any of listed on the right domains.

Operation FEED have 2 forms: search expression FEED type... and search expression FEED NOT type.... First form return only those posts which were found for the search expression on the left and published with a source in one of listed on the right feed types. The second - those which were found for expression on the left and published by a source not of any type listed on the right. Search Engine at the moment supports 3 type of feeds: rss, rdf and atom.

Operation FETCHED have the 2 forms: search expression FETCHED time and search expression FETCHED BEFORE time. First form return only those posts which were found for the search expression on the left and fetched from a source not earlier than specified time. The second - those which were found for expression on the left and fetched earlier than specified time. Time should be expressed in any of forms descibed below.

Operation LANGUAGE have 2 forms: search expression LANGUAGE language code... and search expression LANGUAGE NOT language code.... First form return only those posts which where found for the search expression on the left and written in one of listed on the right languages. The second - those which were found for expression on the left and written in language different from any of listed on the right.