Perhaps you should try some spelling variations:
"modified ddorcaverage approximation algorithms" » "modified average approximation algorithms", "modified dddorcaverage approximation algorithms", "modified ddorcadverage approximation algorithms", "modified ddohcaverage approximation algorithms"
"modified orca convolution algorithms" » "modified orca evolution algorithm", "modified orca solution algorithm", "modified dorca convolution algorithms", "modified orcad convolution algorithms", "modified ohca convolution algorithms"

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