Perhaps you should try some spelling variations:
"modified allocation approximation algorithms" » "modified allocation optimization algorithms"
"modified learning evolution algorithm" » "modified learning solution algorithm", "modified learning evolutionary algorithm", "modified learning convolution algorithms", "modified learning convolution algorithm", "modified learning emotion algorithm", "mobile learning evolution algorithm", "modified caging evolution algorithm"

You may be able to get more results by adjusting your search query.

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