Perhaps you should try some spelling variations:
"policy optimization algorithm" » "policy optimization algorithms", "policy optimisation algorithm", "policy estimation algorithm", "topology optimization algorithm"
"a solution algorithm" » "a evolution algorithm", "a convolution algorithms", "a evolutionary algorithm", "_ solution algorithm", "_ solutions algorithm", "up solutions algorithm"
"nacl solution algorithm" » "nacl evolution algorithm", "nacl convolution algorithms", "nacl evolutionary algorithm", "exact solution algorithm", "nodal solution algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a solution algorithm") OR ("nacl solution algorithm"))) or ("policy optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a solution algorithm") OR ("nacl solution algorithm"))) OR ("policy optimization algorithm")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a solution algorithm\") OR (\"nacl solution algorithm\"))) or (\"policy optimization algorithm\"))".
• Removing quotes may allow a broader search: (((( a solution algorithm ) OR ( nacl solution algorithm ))) or ( policy optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("a solution algorithm") OR ("nacl solution algorithm"))) or ("policy optimization algorithm"))*.