Perhaps you should try some spelling variations:
"policy optimization algorithm" » "policy optimization algorithms", "policy optimisation algorithm", "policy estimation algorithm", "topology optimization algorithm"
"a simulation algorithm" » "a estimation algorithm", "a solution algorithm", "a optimisation algorithm"
"_ simulation algorithm" » "_ estimation algorithm", "_ solution algorithm", "_ optimisation algorithm"

Try widening your search to All Fields.

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