We have rightfully moaned before about this. That is probably why we get totally irrelevant results and missing entries you knew were there before. If you type an exact match you get hardly anything yet if you do a general search on surnames and first names even if you state a county or parish, it still throws up thousands of results, or one correct parent name but the other not, or initials.
Example
type in John Hamilton, parents names George and Sarah in Sussex, you get results like this:-
J Hamilton, father G. And nothing else, no location etc.