First, sorry if this was already mentioned but after using the search function I didnt have the motivation to look through over 90 pages of result if this was already mentioned.
Now to the topic, I think the tags are a really great idea to filter the search but how about expanding the filter - for example:
Lets say I'm looking for oppai, housewives and harem - would it be really time consuming to add a function so everybody could check these tags so that in the results only these would be shown ?
If that would be possible than again another nice addition would be to block some tags so that mangas that contain these are not shown, like in the previous example you search for oppai, housewives and harem but dont want any that contain neotare or cheating.
Adding these function would make it easier to find specific things that the one searching likes instead of searching a tag like "oppai" or "teacher"
This would be a great function because fakku has reached for simple mathematic 330 pages each containing 10 manga that makes 3300 mangas.... thats alot isnt it?
Now I better stop writing because I'm not really good at explaining.