Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
policy optimization » topology optimization
a estimation » _ estimation, a destination, _ estimating

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

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