Best suggestion for the time being, is use Google to find your desired thread.
I have had good success by using a key word and add ww2aircraft.net as an additional keyword.
For example you can find threads that contain Haggis (and there are, actually) by using this search string:
Haggis ww2aircraft.net
If you recall the thread title, try using that:
Hammered But Home ww2aircraft.net
This might be the long way around the block, but it's the best we have for now