Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronize swimming"
"synchronising stemming" » "synchronism stemming", "synchronising streaming", "synchronising steering", "synchronising flemming"
"synchronizing stemming" » "synchronizing streaming", "synchronizing steering", "synchronizing flemming"
"synchronisations stemming" » "synchronisations streaming", "synchronisations steering", "synchronisations flemming", "synchronisation stemming", "synchronizations stemming", "synchronization 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 ("synchronized swimming"))) or ((((("synchronising stemming") OR ("synchronizing stemming"))) or ("synchronisations stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronized swimming"))) OR ((((("synchronising stemming") OR ("synchronizing stemming"))) OR ("synchronisations stemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (\"synchronized swimming\"))) or (((((\"synchronising stemming\") OR (\"synchronizing stemming\"))) or (\"synchronisations stemming\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronized swimming ))) or ((((( synchronising stemming ) OR ( synchronizing stemming ))) or ( synchronisations stemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronized swimming"))) or ((((("synchronising stemming") OR ("synchronizing stemming"))) or ("synchronisations stemming"))))*.