Perhaps you should try some spelling variations:
"vi_ simulation algorithm" » "vi_ optimisation algorithm", "vi_ estimation algorithms", "vi_ evolution algorithm", "via simulation algorithm", "_ simulation algorithm", "a simulation algorithm"
"a solution algorithm" » "a evolution algorithm", "a convolution algorithms", "a evolutionary algorithm", "_ solution algorithm", "_ solutions algorithm", "nacl solution algorithm"
"policy estimation algorithm" » "policy optimization algorithm", "pose estimation algorithm", "motion estimation algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("policy estimation algorithm") or ((("vi_ simulation algorithm") or ("a solution algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("policy estimation algorithm") OR ((("vi_ simulation algorithm") OR ("a solution algorithm")))).
• Removing quotes may allow a broader search: (( policy estimation algorithm ) or ((( vi_ simulation algorithm ) or ( a solution algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("policy estimation algorithm") or ((("vi_ simulation algorithm") or ("a solution algorithm"))))*.