Perhaps you should try some spelling variations:
"modified time approximation algorithm" » "modified time approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified bi1 approximation algorithm", "modified male approximation algorithm"
"modified invasive ventilation algorithm" » "modified invasive estimation algorithm", "modified invasive estimation algorithms", "modified invasive evolution algorithm", "modified adaptive ventilation algorithm", "modified passive ventilation algorithm"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified invasive ventilation algorithm") OR ("modified time approximation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive ventilation algorithm\") OR (\"modified time approximation algorithm\"))".
• Removing quotes may allow a broader search: (( modified invasive ventilation algorithm ) OR ( modified time approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified invasive ventilation algorithm") OR ("modified time approximation algorithm"))*.