^ ^
Searching for "X%20Y" does search on both keywords so does work.
However I might later incorperate Andreas'
multiple option bbcode hack for something like that.
You could use
Code:
<a href="http://search.ebay.com/{option1}%20{option2}">{param}</a>
For instance maybe in conjunction with more advanced ebay options. But in the mean time, my method keeps things simple and works as far as I can see.