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