Perhaps you should try some spelling variations:
"modified quantile approximation algorithms" » "modified time approximation algorithms", "modified diophantine approximation algorithms", "modified adaptive approximation algorithms"
"modified invasive ventilation algorithms" » "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive convolution algorithms", "modified adaptive ventilation algorithms", "modified passive ventilation algorithms"

Try widening your search to All Fields.

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 algorithms") or ("modified quantile approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified invasive ventilation algorithms") OR ("modified quantile approximation algorithms")).
• Removing quotes may allow a broader search: (( modified invasive ventilation algorithms ) or ( modified quantile approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified invasive ventilation algorithms") or ("modified quantile approximation algorithms"))*.