Perhaps you should try some spelling variations:
"synchronising swimming" » "synchronizing swimming", "synchronisations swimming"
"synchronised stemming" » "synchronized stemming", "synchronize stemming", "synchronised streaming", "synchronised steering", "synchronised flemming"
"synchronism stemming" » "synchronism streaming", "synchronism steering", "synchronism flemming", "synchronize stemming", "synchronized 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 ("synchronism stemming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronising swimming\") OR (((\"synchronised stemming\") OR (\"synchronism stemming\"))))*".
• Removing quotes may allow a broader search: (( synchronising swimming ) OR ((( synchronised stemming ) OR ( synchronism stemming ))))*.