Perhaps you should try some spelling variations:
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male approximation algorithms"
"modified learning aided algorithm" » "mobile learning aided algorithm", "modified caging aided algorithm", "modified learning adam algorithm", "modified learning driven algorithm", "modified learning winner algorithm", "modified learning based algorithm", "modified learning model 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 learning aided algorithm") OR ("modified time approximation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified learning aided algorithm\") OR (\"modified time approximation algorithms\"))".
• Removing quotes may allow a broader search: (( modified learning aided algorithm ) OR ( modified time approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified learning aided algorithm") OR ("modified time approximation algorithms"))*.