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

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