Perhaps you should try some spelling variations:
"modified allocation estimation algorithm" » "modified allocation optimization algorithm", "modified motion estimation algorithm"
"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"

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