Perhaps you should try some spelling variations:
"modified static estimation algorithmsss" » "modified static estimation algorithms", "modified static estimation algorithm", "modified static optimization algorithmsss", "modified static estimation algorithmss"
"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 algorithmsss\") OR (\"modified objective approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified static estimation algorithmsss ) OR ( modified objective approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified static estimation algorithmsss") OR ("modified objective approximation algorithms"))*.