Perhaps you should try some spelling variations:
"mobile learning evolutionary algorithm" » "mobile learning evolution algorithm", "mobile learning solution algorithm", "machine learning evolutionary algorithm"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion approximation algorithms\") OR (\"mobile learning evolutionary algorithm\"))~".
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