Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
approximation algorithm » approximation algorithms
passive optimization » bayesian optimization, game optimization, policy optimization
time approximation » one approximation, _ approximation
modified passive » modified adaptive
modified time » modified bi1, modified male

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified time approximation algorithm ) OR ( modified passive optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified time approximation algorithm ) or ( modified passive optimization algorithms ))*.