Perhaps you should try some spelling variations:
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation algorithms"
"modified model solutions algorithms" » "modified model solution algorithm", "modified model evolution algorithm", "modified model convolution algorithms", "modified nodal solution algorithms", "modified global solutions algorithms", "modified male solutions algorithms"

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