Perhaps you should try some spelling variations:
"modified allocation approximation algorithms" » "modified allocation optimization algorithms"
"modified adaptive evolutionary algorithm" » "modified adaptive evolution algorithm", "modified adaptive solution algorithm", "modified objective evolutionary algorithm", "modified passive evolutionary algorithm"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified adaptive evolutionary algorithm\") OR (\"modified allocation approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified adaptive evolutionary algorithm ) OR ( modified allocation approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified adaptive evolutionary algorithm") OR ("modified allocation approximation algorithms"))*.