Reduce your posting speed and double posts... you wont get answers faster with more post... you will just reduce the chance of an answer...

There are many many reasons why a search might not get results: no query routing table exchanged yet, files not fully hashed, hosts appear firewalled (icon in lower left corner), host is busy... and on and on and on... you might need to debug your special case..
You might like to check if the query reaches its destination (query monitor tab) and then debug why the destination doesn't answer.
For example check ShareManager.handleQuery() starting at line 135
There are various reasons stated why a search gets no responses.
Also MessageDispatcher.handleQuery() at line 213 might drop/ignore out of whatever reason.

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