Perhaps you should try some spelling variations:
"policy estimation algorithms" » "policy optimization algorithms", "policy optimisation algorithm", "policy approximation algorithms", "pose estimation algorithms", "motion estimation algorithms"
"_ simulation algorithm" » "_ solution algorithm", "_ optimisation algorithm", "_ evolution algorithm"
"a estimation algorithm" » "_ estimation algorithm", "a destination algorithm", "_ estimating algorithm"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("a estimation algorithm") OR ("_ simulation algorithm"))) OR ("policy estimation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a estimation algorithm\") OR (\"_ simulation algorithm\"))) OR (\"policy estimation algorithms\"))".
• Removing quotes may allow a broader search: (((( a estimation algorithm ) OR ( _ simulation algorithm ))) OR ( policy estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("a estimation algorithm") OR ("_ simulation algorithm"))) OR ("policy estimation algorithms"))*.