Perhaps you should try some spelling variations:
"modified learning estimation algorithm" » "modified learning emotion algorithm", "modified lighting estimation algorithm", "mobile learning estimation algorithm", "modified caging estimation algorithm"
"modified df approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified adam approximation algorithms", "modified bi1 approximation 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 learning estimation algorithm") or ("modified df approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified learning estimation algorithm") OR ("modified df approximation algorithms")).
• Removing quotes may allow a broader search: (( modified learning estimation algorithm ) or ( modified df approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified learning estimation algorithm") or ("modified df approximation algorithms"))*.