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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("synchronised stemming") or ((((("synchronize swimming") or ("synchronized swimming"))) or ("synchronizing streaming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised stemming") OR ((((("synchronize swimming") OR ("synchronized swimming"))) OR ("synchronizing streaming")))).
• Removing quotes may allow a broader search: (( synchronised stemming ) or ((((( synchronize swimming ) or ( synchronized swimming ))) or ( synchronizing streaming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised stemming") or ((((("synchronize swimming") or ("synchronized swimming"))) or ("synchronizing streaming"))))*.