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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronism swimming") or ((("synchronising stemming") or ("synchronised steering"))))) or ("synchronize swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronism swimming") OR ((("synchronising stemming") OR ("synchronised steering"))))) OR ("synchronize swimming")).
• Removing quotes may allow a broader search: (((( synchronism swimming ) or ((( synchronising stemming ) or ( synchronised steering ))))) or ( synchronize swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronism swimming") or ((("synchronising stemming") or ("synchronised steering"))))) or ("synchronize swimming"))*.