Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"
"modified passive estimation algorithmss" » "modified passive estimation algorithms", "modified passive estimation algorithm", "modified passive optimization algorithms", "modified pose estimation algorithmss", "modified adaptive estimation algorithmss"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified objective optimization algorithm") or ("modified passive estimation algorithmss"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimization algorithm") OR ("modified passive estimation algorithmss")).
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