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