Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified flour solution algorithms" » "modified flour solution algorithm", "modified flour evolution algorithm", "modified flour convolution algorithms", "modified four solution algorithms", "modified floor solution algorithms", "modified flor solution algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified flour solution algorithms\") OR (\"modified notion approximation algorithms\"))~".
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