Perhaps you should try some spelling variations:
"olive branch initiation" » "olive branch migration"
"olive cancer initiation" » "olive cancer invasion", "olive cancer radiation", "live cancer initiation", "liver cancer initiation", "life cancer initiation"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"olive branch initiation\") OR (\"olive cancer initiation\"))".
• Removing quotes may allow a broader search: (( olive branch initiation ) OR ( olive cancer initiation )).
• Adding a wildcard symbol may retrieve word variants: (("olive branch initiation") OR ("olive cancer initiation"))*.