Perhaps you should try some spelling variations:
"modified notion estimation algorithms" » "modified notion estimation algorithm", "modified notion optimization algorithms", "modified notion optimisation algorithm", "modified motion estimation algorithms"
"modified cover optimized algorithms" » "modified cover optimized algorithm", "modified cover optimizer algorithms", "modified cover optimization algorithms", "modified covers optimized algorithms", "modified over optimized algorithms"

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