Perhaps you should try some spelling variations:
"pose estimation algorithms" » "pose estimation algorithm", "pose optimization algorithms", "pose optimisation algorithm"
"3d simulation algorithm" » "3d estimation algorithm", "3d optimisation algorithm", "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"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("3d simulation algorithm") OR ("3d solution algorithm"))) or ("pose estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("3d simulation algorithm") OR ("3d solution algorithm"))) OR ("pose estimation algorithms")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"3d simulation algorithm\") OR (\"3d solution algorithm\"))) or (\"pose estimation algorithms\"))".
• Removing quotes may allow a broader search: (((( 3d simulation algorithm ) OR ( 3d solution algorithm ))) or ( pose estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("3d simulation algorithm") OR ("3d solution algorithm"))) or ("pose estimation algorithms"))*.