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

You may be able to get more results by adjusting your search query.

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