Perhaps you should try some spelling variations:
"modified discursive convolution algorithms" » "modified discursive construction algorithms", "modified discursive evolution algorithm", "modified discursive solution algorithm"
"modified motion estimation algorithms" » "modified motion estimation algorithm", "modified motion optimization algorithms", "modified motion optimisation algorithm", "modified notion estimation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified motion estimation algorithms") OR ("modified discursive convolution algorithms"))~.
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