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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronised swimming") OR ("synchronism swimming"))) or ((("synchronising stemming") or ("synchronize stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronism swimming"))) OR ((("synchronising stemming") OR ("synchronize stemming"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") OR (\"synchronism swimming\"))) or (((\"synchronising stemming\") or (\"synchronize stemming\"))))*".
• Removing quotes may allow a broader search: (((( synchronised swimming ) OR ( synchronism swimming ))) or ((( synchronising stemming ) or ( synchronize stemming ))))*.