Perhaps you should try some spelling variations:
"modified invasive estimation algorithmss" » "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive optimization algorithms", "modified invasive ventilation algorithmss", "modified passive estimation algorithmss"
"modified objective approximation algorithms" » "modified objective approximation algorithm"

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