Perhaps you should try some spelling variations:
objective optimisation » objective optimization, multiobjective optimization
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
search algorithm » source algorithm
machine using » machines using, machinery using
using search » using egarch, nursing research, using servo

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 optimisation algorithm ) or ( machine using search algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified objective optimisation algorithm ) OR ( machine using search algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified objective optimisation algorithm ) or ( machine using search algorithm ))*.