Perhaps you should try some spelling variations:
"modified based estimation algorithms" » "modified based estimation algorithm", "modified based optimization algorithms", "modified based optimisation algorithm", "modified pose estimation algorithms", "modified based investigation algorithms", "modified pulses estimation algorithms", "modified male estimation algorithms"
"modified objective predators algorithm" » "modified objective predation algorithm"

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