Perhaps you should try some spelling variations:
"modified model solution algorithm" » "modified model evolution algorithm", "modified model convolution algorithms", "modified model evolutionary algorithm", "modified male solution algorithm", "modified model solutions algorithm", "modified nodal solution algorithm", "modified model selection algorithm"
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near approximation algorithms"

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