Perhaps you should try some spelling variations:
"modified model solutions algorithm" » "modified model solution algorithm", "modified model evolution algorithm", "modified model evolutionary algorithm", "modified nodal solution algorithm", "modified global solutions algorithm", "modified male solutions algorithm"
"modified average approximation algorithms" » "modified coverage approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified average approximation algorithms\") OR (\"modified model solutions algorithm\"))~".
• Removing quotes may allow a broader search: (( modified average approximation algorithms ) OR ( modified model solutions algorithm ))~.
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