Perhaps you should try some spelling variations:
"3d simulation algorithm" » "3d optimisation algorithm", "3d estimation algorithms", "3d evolution algorithm", "_ simulation algorithm", "a simulation algorithm", "mri simulation algorithm"
"3d solution algorithm" » "3d evolution algorithm", "3d convolution algorithms", "3d evolutionary algorithm", "_ solution algorithm", "up solutions 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 ((("3d simulation algorithm") OR ("3d solution algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("policy estimation algorithm") OR ((("3d simulation algorithm") OR ("3d solution algorithm")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"policy estimation algorithm\") or (((\"3d simulation algorithm\") OR (\"3d solution algorithm\"))))".
• Removing quotes may allow a broader search: (( policy estimation algorithm ) or ((( 3d simulation algorithm ) OR ( 3d solution algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("policy estimation algorithm") or ((("3d simulation algorithm") OR ("3d solution algorithm"))))*.