Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ optimization algorithm"
"pose estimation algorithms" » "pose estimation algorithm", "pose optimization algorithms", "pose approximation algorithms", "poses estimation algorithms", "post estimation algorithms", "jose estimation algorithms"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ approximation algorithms"

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 ("_ estimation algorithms"))) or ("_ optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pose estimation algorithms") OR ("_ estimation algorithms"))) OR ("_ optimisation algorithm")).
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