Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified make estimation algorithmss" » "modified make estimation algorithms", "modified make estimation algorithm", "modified make optimization algorithms", "modified pose estimation algorithmss", "modified male estimation algorithmss"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified make estimation algorithmss") OR ("modified objective approximation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified make estimation algorithmss\") OR (\"modified objective approximation algorithm\"))*".
• Removing quotes may allow a broader search: (( modified make estimation algorithmss ) OR ( modified objective approximation algorithm ))*.