Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified model evolution algorithm" » "modified model solution algorithm", "modified model evolutionary algorithm", "modified model convolution algorithms", "modified model solutions algorithm", "modified global evolution algorithm", "modified male evolution 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 model evolution algorithm") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified model evolution algorithm") OR ("modified notion approximation algorithms"))*.
• Removing quotes may allow a broader search: (( modified model evolution algorithm ) or ( modified notion approximation algorithms ))*.