example: machine learning

To specify the search logic, enter the first term to search followed by the logic and the second term, for example medicine NOT healthcare
Logic words cannot be repeated
Symbols #%{^&/}()[]~!+-\ are not recognized
A colon " : " can only follow a tag, for example tag:machine_learning
The number of quotation marks should be even
Except when searching a single tag at the beginning, the logic before a tag must be AND, for example biology AND tag:machine_learning
The symbol after any tag must be a colon " : ", for example tag:machine_learning
Remove duplicate search tags