Perhaps you should try some spelling variations:
"modified static estimation algorithmssss" » "modified static estimation algorithms", "modified static estimation algorithm", "modified static optimization algorithmssss", "modified static estimation algorithmsss"
"modified objective approximation algorithms" » "modified objective approximation algorithm"

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