Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
game optimization » stage optimization, qoe optimization, market optimization
making methods » learning methods, graining methods
active making » active reading, active packaging
modified game » modified male, modified adam

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

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