Query examples:

summer
FLUIdS will find all documents that contains the exact word "summer";

hot summer
FLUIdS will find the documents containing all of the entered words ("hot" and "summer"), but not necessarily next to each other or in that order;

(hot | warm) & summer
(hot or warm) and summer
FLUIdS will find any document which contains the word "summer"; provided that it also contains either the word "hot", or the word "warm", or both;

summer & !cold
summer and not cold
FLUIdS will find any document that contains the word "summer", provided that it does not contain the word "cold";

"not"  "and"
FLUIdS will find the documents containing both the word "not" and the word "and". Notice, that the quotation marks around the word "not" cannot be omitted, otherwise FLUIdS will find all the documents which do not contain the word "and";

hand*
FLUIdS will find the documents containing the words, which begin with "hand" (including the word "hand" itself). The tailing asterisk (*) represents any missing part of the word. In this examples the following words will match the query: "hand", "hands", "handsome", "handkerchief", etc.