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