Perhaps you should try some spelling variations:
"synchronising swimming" » "synchronizing swimming", "synchronisations swimming"
"synchronised stemming" » "synchronized stemming", "synchronised streaming", "synchronised steering", "synchronised flemming"
"synchronism stemming" » "synchronism streaming", "synchronism steering", "synchronism flemming", "synchronized stemming"
"synchronize stemming" » "synchronize streaming", "synchronize steering", "synchronize flemming", "synchronized stemming", "synchronizing stemming"

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