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