Perhaps you should try some spelling variations:
"synchronising stemming" » "synchronizing stemming", "synchronisations stemming", "synchronising streaming", "synchronising steering", "synchronising stepping"
"synchronism stemming" » "synchronism streaming", "synchronism steering", "synchronism stepping", "synchronize stemming"
"synchronised flemming" » "synchronize flemming"
"synchronised fleming" » "synchronize fleming"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("synchronized swimming") or ((((("synchronising stemming") or ("synchronism stemming"))) or ((("synchronised flemming") or ("synchronised fleming"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronized swimming") OR ((((("synchronising stemming") OR ("synchronism stemming"))) OR ((("synchronised flemming") OR ("synchronised fleming")))))).
• Removing quotes may allow a broader search: (( synchronized swimming ) or ((((( synchronising stemming ) or ( synchronism stemming ))) or ((( synchronised flemming ) or ( synchronised fleming )))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronized swimming") or ((((("synchronising stemming") or ("synchronism stemming"))) or ((("synchronised flemming") or ("synchronised fleming"))))))*.