Limited advenved search

In the previous version of SBI site, I was able to find the 400 (or 500 ?) last posts of a member, in performing an advanced search on is user name.

But now, when I check "search type; all types", "user name:Renk" ("exact name" checked), the search returns me only the 70 posts I started, and not the 232 I wrote.

Is there a way in order to find all 400 or 500 last posts of a member (I ask not for all post, because during each search about "anon", SBI server will explode).

Code:

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http://www.sb-innovation.de/search.php?do=finduser&userid=USER_ID_HERE&contenttype=vBForum_Post&showposts=1

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