Searchoption:

These expressions	help to find:
NOT     not     !	Documents not containing the word behind   NOT  not  !
AND    and    &	Documents containing both words separated by   AND  and  &
OR        or      |	Documents containing at least one of the words separated by OR or  |
*	Documents which contain the letters mentioned before or after the *

These search options	find the following documents:
cat & dog & fisch	All of these three words
cat AND NOT dog	Cat but not dog
cat | dog | fisch	Either cat, dog or fish
dog*	Dog; dogfish;dogcategory;...
*fish	Selfish;catfish;dogfish;...
(dog AND cat) OR fish	Both, dog and cat or fish
dog AND (cat OR fish)	Both, dog and cat or fish
dog AND NOT (cat OR fisch)	Dog but without cat or fish

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