Perhaps you should try some spelling variations:
"modified static optimization algorithmss" » "modified static optimization algorithms", "modified static optimisation algorithm", "modified static estimation algorithms", "modified stage optimization algorithmss", "modified stochastic optimization algorithmss", "modified staffing optimization algorithmss"
"modified objective approximation algorithms" » "modified objective approximation algorithm"

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