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