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

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