Search not finding items using the Search-tab in Qt Assistant

Steps to produce:

1. Search for word 'multi' in the search tab

• search results are e.g.
• Qt 4.7 QMultiMap Class Reference
• Qt 4.7 Q3ListBox Class Reference

2. Search for word 'multi*' in the search tab

• search results are e.g:
• Qt 4.7: multiple.pro Example File
• Qt 4.7: multipleinheritance.pro Example File

3. Search for word 'multithread' in the search tab

• search result is:
• Qt 4.7: Reentrancy and Thread-Safety

So if you search for word 'multi', the search finds words that has word 'multi' in them, but it doesn't find the word 'multithread'. Searching for 'multi*' does not find any matches for 'multithread' either. I'm expecting to get quite similar results with these searches, but the results are completely different. Hardly any of the search hits are pointing to the same help files. It almost seems that it ignores the * to some extent.

This is a big problem in other languages (e.g. in Japanese) where the words in the sentences are combined together.