Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
time approximation » one approximation, _ approximation
game optimization » stage optimization, qoe optimization, market optimization
modified game » modified male, modified adam
modified time » modified bi1, modified male

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified game optimization algorithms ) or ( modified time approximation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified game optimization algorithms ) OR ( modified time approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( modified game optimization algorithms ) or ( modified time approximation algorithms ))*.