Perhaps you should try some spelling variations:
"policy optimization algorithms" » "policy optimisation algorithm", "policy estimation algorithms", "policy optimized algorithms", "topology optimization algorithms"
"_ solutions algorithm" » "_ solution algorithm", "_ evolution algorithm", "_ evolutionary algorithm"
"a estimation algorithm" » "_ estimation algorithm", "a destination algorithm", "_ estimating algorithm"

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 algorithms") or ((("a estimation algorithm") or ("_ solutions algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("policy optimization algorithms") OR ((("a estimation algorithm") OR ("_ solutions algorithm")))).
• Removing quotes may allow a broader search: (( policy optimization algorithms ) or ((( a estimation algorithm ) or ( _ solutions algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("policy optimization algorithms") or ((("a estimation algorithm") or ("_ solutions algorithm"))))*.