Search for "again" or "Again!!" and notice no results are found.

Howerver, it's right here: http://www.mangaupdates.com/series.html?id=64690

Works fine for me.
I typed Again, Again!, and Again!! and results are found.
The only time nothing popped up was when I typed Again ! (with the space in between the N and ! )

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It works for me as well. Perhaps you should try clearing your cache as no one else is suffering from it...

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I don't mean the quick search on the main page, but the one you get after clicking Series Info.

I just noticed the quick search is called "Manga Search" while all it does is search releases (it never finds manga without scanlations) hence the confusion.

Although I don't know the reason since I don't program, the quick search feature has trouble with certain words, such as "again" and "zero," which yield no results even though there are plenty of manga with those words in their name. But you can get around it by putting whatever you're searching for in double quotes--this forces the search to look for the exact sequence of characters in titles (as opposed to its default "best match" search mode).

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