Perhaps you should try some spelling variations:
objective predation » objective allocation
predation algorithm » predators algorithm, estimation algorithm
search algorithm » source algorithm
based search » based research, based sers
code based » model based, coal based, income based

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified objective predation algorithm ) or ( code based search algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified objective predation algorithm ) OR ( code based search algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified objective predation algorithm ) or ( code based search algorithm ))*.