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