Perhaps you should try some spelling variations:
"modified thermal solution algorithm" » "modified thermal evolution algorithm", "modified thermal convolution algorithms", "modified thermal evolutionary algorithm", "modified chemical solution algorithm", "modified optimal solution algorithm", "modified minimal solution algorithm"
"modified parameter approximation algorithms" » "modified parameters approximation algorithms"

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