Perhaps you should try some spelling variations:
"modified static estimation algorithms" » "modified static estimation algorithm", "modified static optimization algorithms", "modified static optimisation algorithm"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male approximation algorithms"

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