Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified thermal predation algorithm" » "modified thermal predators algorithm", "modified thermal estimation algorithm", "modified thermal oxidation algorithm", "modified thermal degradation algorithm", "modified thermal protection algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified thermal predation algorithm") OR ("modified objective approximation algorithm"))~.
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