Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified education evolution algorithm" » "modified education evaluation algorithm", "modified equation solution algorithm", "modified education solution algorithm", "modified education evolutionary algorithm", "modified education convolution algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified education evolution algorithm") OR ("modified coverage approximation algorithms"))~.
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