All I can think of is to make sure that you do not have any spaces before or after your search terms, as spaces will be included as part of the search (so if you had a double space before or after your parenthesis terms it would not included the result unless a seller had double spaces).
Searching for the big search you posted above shows me a list of those items, if the problem is consistent then it may be a bug in the programming or a cap on the database query length or something.
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