Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified global solutions algorithm" » "modified global solution algorithm", "modified global evolution algorithm", "modified global evolutionary algorithm", "modified model solutions algorithm", "modified nodal solution algorithm"

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