Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified thermal solution algorithms" » "modified thermal solution algorithm", "modified thermal evolution algorithm", "modified thermal convolution algorithms", "modified chemical solution algorithms", "modified optimal solution algorithms", "modified minimal solution algorithms"

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