When searching for content on Tableau Server (including opening server content from Tableau Desktop) search won't work if parenthesis or minus sign exists right next to the search string. This might be the case with other signs as well. Currently this can be circumvented by putting quotation marks next to the search term.
This is a solution that most business users are unaware of and it would be better if this was entirely integrated into the search feature. I myself would consider this a bug, but Tableau Support disagrees with me on this one.