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