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

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

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