Perhaps you should try some spelling variations:
"policy optimization algorithm" » "policy optimization algorithms", "policy optimisation algorithm", "policy estimation algorithms", "topology optimization algorithm"
"_ simulation algorithm" » "_ solution algorithm", "_ optimisation algorithm", "_ estimation algorithms"
"a estimation algorithm" » "_ estimation algorithm", "a destination algorithm", "_ estimating 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: (((("a estimation algorithm") or ("_ simulation algorithm"))) or ("policy optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a estimation algorithm") OR ("_ simulation algorithm"))) OR ("policy optimization algorithm")).
• Removing quotes may allow a broader search: (((( a estimation algorithm ) or ( _ simulation algorithm ))) or ( policy optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("a estimation algorithm") or ("_ simulation algorithm"))) or ("policy optimization algorithm"))*.