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

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: (("synchronising swimming") OR ((((("synchronised stemming") OR ((("synchronize stemming") OR ("synchronize steering"))))) OR ("synchronised streaming"))))~.
• Removing quotes may allow a broader search: (( synchronising swimming ) or ((((( synchronised stemming ) or ((( synchronize stemming ) or ( synchronize steering ))))) or ( synchronised streaming ))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronising swimming") or ((((("synchronised stemming") or ((("synchronize stemming") or ("synchronize steering"))))) or ("synchronised streaming"))))*.