Our search is less than ideal but it does the job adequately. Yes, it would be nice if ' and ’ were interchangeable. It would also be nice if spelling one word incorrectly didn't spoil the entire search.
However, these things take time and we don't exactly have the resources to make changes on the fly. If you really don't want to be bothered with changing your searches, then you could use Google with a site search modifier (i.e.
site:vgmdb.net)