Perhaps you should try some spelling variations:
"synchronising swimming" » "synchronism swimming", "synchronisations swimming"
"synchronize swimming" » "synchronism swimming"
"synchronized swimming" » "synchronismd swimming"
"synchronizing 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: (("synchronising swimming") or ((((("synchronize swimming") or ("synchronized swimming"))) or ("synchronizing stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronising swimming") OR ((((("synchronize swimming") OR ("synchronized swimming"))) OR ("synchronizing stemming")))).
• Removing quotes may allow a broader search: (( synchronising swimming ) or ((((( synchronize swimming ) or ( synchronized swimming ))) or ( synchronizing stemming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronising swimming") or ((((("synchronize swimming") or ("synchronized swimming"))) or ("synchronizing stemming"))))*.