Perhaps you should try some spelling variations:
synfire chain » synfire chains, entire chain, synfue chains
single chains » single channel, single domains, single chip
singie chain » side chain, single chip, ising chain
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 ( singie chain ))) OR ( ((single chains) OR (single chain)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( synfire chain ) or ( singie chain ))) or ( ((single chains) OR (single chain)) ))".
• Adding a wildcard symbol may retrieve word variants: (((( synfire chain ) or ( singie chain ))) or ( ((single chains) OR (single chain)) ))*.