Perhaps you should try some spelling variations:
"modified water convolution algorithms" » "modified water evolution algorithm", "modified water solution algorithm", "modified dilated convolution algorithms", "modified water solution algorithms", "modified male convolution algorithms"
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified water convolution algorithms\") OR (\"modified objective allocation algorithms\"))~".
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