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

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

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