There are tools around to do this.

You could use the KVS tool: http://www.flyertalk.com/forum/trave...lity-tool.html

I heard the ANA FFPs engine is pretty good as well: http://onemileatatime.boardingarea.c...d-search-tool/

Or if you have some fixed date ranges in mind and know the destination you might post it here on FT (I would try the Star Alliance Forum or Information Desk) and ask the fellow people to help you out. Some around here have a pretty good talent finding availability (Btw, I'm not one of them ) and might be willing to help if you ask nicely.