Perhaps you should try some spelling variations:
"modified bi1 estimation algorithms" » "modified bi1 estimation algorithm", "modified bi1 optimization algorithms", "modified bi1 optimisation algorithm", "modified risk estimation algorithms", "modified _ estimation algorithms"
"modified passive solution algorithm" » "modified passive evolution algorithm", "modified passive convolution algorithms", "modified passive evolutionary algorithm", "modified adaptive solution algorithm", "modified positive solutions algorithm", "modified saline solution algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified passive solution algorithm\") OR (\"modified bi1 estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified passive solution algorithm ) OR ( modified bi1 estimation algorithms ))~.
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