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

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