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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified game optimization algorithms ) OR ( modified adam approximation algorithm ))~.
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