Perhaps you should try some spelling variations:
"modified time approximation algorithm" » "modified time approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified bi1 approximation algorithm", "modified male approximation algorithm"
"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 time approximation algorithm\") OR (\"modified passive solution algorithm\"))~".
• Removing quotes may allow a broader search: (( modified time approximation algorithm ) OR ( modified passive solution algorithm ))~.
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