Perhaps you should try some spelling variations:
"modified response approximation algorithms" » "modified one approximation algorithms", "modified response association 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 response approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified adaptive estimation algorithm") OR ("modified response approximation algorithms")).
• Removing quotes may allow a broader search: (( modified adaptive estimation algorithm ) or ( modified response approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified adaptive estimation algorithm") or ("modified response approximation algorithms"))*.