Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified mild evolution algorithm" » "modified mild solution algorithm", "modified mild evolutionary algorithm", "modified mild convolution algorithms", "modified time evolution algorithm", "modified mild solutions algorithm", "modified male evolution algorithm", "modified seird evolution algorithm", "modified bi1 evolution algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified mild evolution algorithm") or ("modified coverage approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified mild evolution algorithm") OR ("modified coverage approximation algorithms"))*.
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