Perhaps you should try some spelling variations:
"modified network estimation algorithm" » "modified network optimization algorithm", "certified network estimation algorithm", "defined network estimation algorithm", "modified near estimation algorithm"
"machines learning method algorithm" » "machine learning method algorithm", "active learning method algorithm", "mapping learning method algorithm", "machines learning mom algorithm", "machines learning methods algorithm", "machines graining methods algorithm", "machines learning emotion algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("machines learning method algorithm") or ("modified network estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("machines learning method algorithm") OR ("modified network estimation algorithm")).
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