Perhaps you should try some spelling variations:
"pose estimation algorithms" » "pose estimation algorithm", "pose optimization algorithms", "pose optimisation algorithm", "post estimation algorithms", "jose estimation algorithms", "dose estimation algorithms"
"poses estimation algorithms" » "poses estimation algorithm", "poses optimization algorithms", "poses optimisation algorithm", "pulses estimation algorithms", "cover estimations algorithms", "risk estimation algorithms", "posts estimation algorithms", "joses estimation algorithms", "doses estimation algorithms"
"a solution algorithm" » "a evolution algorithm", "a convolution algorithms", "a evolutionary algorithm", "_ solution algorithm", "_ solutions algorithm", "nacl solution algorithm"

Try widening your search to All Fields.

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