You can use the folowing signs before words :
- words without sign infront : find all data that contains at least one such word
- wirds with + infront : data MUST contain all this words
- words with - infront : data MUST NOT contain any of these words
Query can include words with any sign infront (but only one sign per word).
There mustn't be any space between sign and word and there must be space between words.
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