Perhaps you should try some spelling variations:
"synchronism swimming" » "synchronising swimming"
"synchronism stemming" » "synchronising stemming", "synchronism streaming", "synchronism steering", "synchronism flemming"
"synchronize swimming" » "synchronizing swimming"
"synchronized swimming" » "synchronizingd 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 ("synchronism stemming"))) or ((("synchronize swimming") or ("synchronized swimming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronism swimming") OR ("synchronism stemming"))) OR ((("synchronize swimming") OR ("synchronized swimming")))).
• Removing quotes may allow a broader search: (((( synchronism swimming ) or ( synchronism stemming ))) or ((( synchronize swimming ) or ( synchronized swimming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronism swimming") or ("synchronism stemming"))) or ((("synchronize swimming") or ("synchronized swimming"))))*.