Perhaps you should try some spelling variations:
"pose optimisation algorithm" » "pose optimization algorithms", "pose estimation algorithms", "qoe optimization algorithm", "_ optimisation algorithm", "pose estimation algorithm"
"_ optimized algorithm" » "_ optimized algorithms", "_ optimizer algorithms"
"risk estimation algorithm" » "pose estimation algorithm"

Try widening your search to All Fields.

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