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

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