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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("pose estimation algorithm") or ("_ optimization algorithm"))) or ("_ optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pose estimation algorithm") OR ("_ optimization algorithm"))) OR ("_ optimisation algorithm")).
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• Adding a wildcard symbol may retrieve word variants: (((("pose estimation algorithm") or ("_ optimization algorithm"))) or ("_ optimisation algorithm"))*.