Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
passive optimization » bayesian optimization, game optimization, policy optimization
optimized algorithm » optimized algorithms, optimizer algorithms
modified passive » modified adaptive
df optimized » _ optimized, _ optimize
modified df » modified _, modified adam, modified bi1

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 passive optimization algorithms ) OR ( modified df optimized algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified passive optimization algorithms ) or ( modified df optimized algorithm ))*.