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