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

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

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