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

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