Search words separated by spaces are "AND'ed".
(Example: 'John Smith' means search for "John AND Smith')
Search words precedet by "|" are OR'ed.
(Example: 'entertainment london | paris' means search for Entertainment AND London OR Paris.
To search for exact phrase suround it with double quotes: '"' ('inch-mark').
(Example: '"Black Sea"').
Search is case-insensitive (for both latin and cyrilic letters).

NOTE: "OR" & "AND" words have no special menaning inside search phrase!

Search is not looking for exact word matches only.
For example search for "Hil" will match also "Hillary", "Hilfinger", "Hill" etc.