Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
static optimization » stage optimization, stochastic optimization, staffing optimization
near approximation » one approximation, network approximation, _ approximation
modified near » modified seird, modified adam

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