Perhaps you should try some spelling variations:
"synchronisations swimming" » "synchronisation swimming", "synchronizations swimming", "synchronization swimming"
"synchronism swimming" » "synchronized swimming"
"synchronize swimming" » "synchronized swimming"
"synchronizing swimming" » "synchronized 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 ("synchronizing 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 ("synchronizing 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 (\"synchronizing swimming\"))))) or (\"synchronised stemming\"))".
• Removing quotes may allow a broader search: (((((((( synchronising swimming ) or ( synchronisations swimming ))) or ( synchronism swimming ))) or ((( synchronize swimming ) OR ( synchronizing swimming ))))) or ( synchronised stemming )).
• Adding a wildcard symbol may retrieve word variants: (((((((("synchronising swimming") or ("synchronisations swimming"))) or ("synchronism swimming"))) or ((("synchronize swimming") OR ("synchronizing swimming"))))) or ("synchronised stemming"))*.