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