Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
static optimisation » static optimization, stage optimization, stochastic optimization
time approximation » one approximation, _ approximation
modified time » modified bi1, modified male

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