Perhaps you should try some spelling variations:
"synfire chain" » "synfire chains", "entire chain", "singie chain"
"single chains" » "single channel", "single domains", "single chip", "single channels"
"single chain" » "single channel"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synfire chain") OR ("single chain"))) OR ("single chains")).
• Removing quotes may allow a broader search: (((( synfire chain ) or ( single chain ))) or ( single chains )).
• Adding a wildcard symbol may retrieve word variants: (((("synfire chain") or ("single chain"))) or ("single chains"))*.