Perhaps you should try some spelling variations:
"modified pose estimation algorithms" » "modified pose estimation algorithm", "modified pose optimization algorithms", "modified pose optimisation algorithm", "modified male estimation algorithms", "modified passive estimation algorithms"
"modified caging optimized algorithm" » "modified caging optimized algorithms", "modified caging optimizer algorithms", "modified aging optimized algorithm", "modified changing optimized algorithm", "modified charging optimized algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified pose estimation algorithms\") OR (\"modified caging optimized algorithm\"))~".
• Removing quotes may allow a broader search: (( modified pose estimation algorithms ) OR ( modified caging optimized algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified pose estimation algorithms") OR ("modified caging optimized algorithm"))*.