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

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: (((("synchronised stemming") OR ("synchronism stemming"))) OR ((("synchronize swimming") OR ("synchronizing swimming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised stemming\") or (\"synchronism stemming\"))) or (((\"synchronize swimming\") OR (\"synchronizing swimming\"))))~".
• Removing quotes may allow a broader search: (((( synchronised stemming ) or ( synchronism stemming ))) or ((( synchronize swimming ) OR ( synchronizing swimming ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("synchronised stemming") or ("synchronism stemming"))) or ((("synchronize swimming") OR ("synchronizing swimming"))))*.