Perhaps you should try some spelling variations:
approximations algorithms » approximation algorithms, approximation algorithm
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
rough approximations » one approximation
market optimization » game optimization, parameter optimization, market capitalization

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( market optimization algorithms ) OR ( rough approximations algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( market optimization algorithms ) OR ( rough approximations algorithms ))*.