Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, optimized algorithms
dfdaptive estimation » adaptive ventilation, quantile estimation
modified dfdaptive » modified adaptive
a optimization » _ optimization, _ optimisation, game optimization
modified a » modified _, modified df, modified adam

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified a optimization algorithms ) or ( modified dfdaptive estimation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified a optimization algorithms ) OR ( modified dfdaptive estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified a optimization algorithms ) or ( modified dfdaptive estimation algorithm ))*.