Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming"
"synchronism swimming" » "synchronized swimming"
"synchronising stemming" » "synchronizing stemming", "synchronising streaming", "synchronising steering", "synchronising flemming"
"synchronisations stemming" » "synchronisations streaming", "synchronisations steering", "synchronisations flemming", "synchronisation stemming", "synchronizations stemming", "synchronization stemming"
"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 ("synchronisations 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 ("synchronisations 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 (\"synchronisations stemming\"))) or (\"synchronize stemming\"))))*".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronism swimming ))) or ((((( synchronising stemming ) OR ( synchronisations stemming ))) or ( synchronize stemming ))))*.