Problem drilling down with keywords

[jstruse]

I have begun adding keywords to my galleries to help my customers find the pixtures they are most interested in. I only have anywhere from 3 - 5 keywords defined for each picture but when I start trying to drill down after the first keyword there are only at most 5 choices in the 'combine with:' keywords.

For example at my homepage below, if you choose the keyword bloomfield you are unable to choose awards or drum major.

http://whhsband.smugmug.com

Is there someway to increase the number of keywords in the 'combine with:' choices?

Thanks,
John