Perhaps you should try some spelling variations:
"modified time solutions algorithm" » "modified time solution algorithm", "modified time evolution algorithm", "modified time evolutionary algorithm", "modified mild solutions algorithm", "modified bi1 solutions algorithm", "modified male solutions algorithm"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male approximation algorithms"

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