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

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

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