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 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 solution algorithm\"))~".
• Removing quotes may allow a broader search: (( modified average approximation algorithms ) OR ( modified model solution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified average approximation algorithms") OR ("modified model solution algorithm"))*.