Perhaps you should try some spelling variations:
"policy optimization algorithms" » "policy optimisation algorithm", "policy estimation algorithms", "policy estimation algorithm", "topology optimization algorithms"
"a simulation algorithms" » "a estimation algorithms", "a estimation algorithm", "_ simulation algorithms"
"a solution algorithm" » "a evolution algorithm", "a convolution algorithms", "a evolutionary algorithm", "_ solution algorithm", "_ solutions 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: (("policy optimization algorithms") or ((("a simulation algorithms") OR ("a solution algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("policy optimization algorithms") OR ((("a simulation algorithms") OR ("a solution algorithm")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"policy optimization algorithms\") or (((\"a simulation algorithms\") OR (\"a solution algorithm\"))))".
• Removing quotes may allow a broader search: (( policy optimization algorithms ) or ((( a simulation algorithms ) OR ( a solution algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("policy optimization algorithms") or ((("a simulation algorithms") OR ("a solution algorithm"))))*.