Perhaps you should try some spelling variations:
"modified multiobjective optimizer algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective optimized algorithms", "modified multiobjective optimized algorithm"
"modified virus prediction algorithm" » "modified virus predation algorithm", "modified virus predators algorithm", "modified fire prediction algorithm", "modified risk prediction algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified virus prediction algorithm") OR ("modified multiobjective optimizer algorithms"))~.
• Removing quotes may allow a broader search: (( modified virus prediction algorithm ) or ( modified multiobjective optimizer algorithms ))~.
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