Perhaps you should try some spelling variations:
"modified allocation approximation algorithms" » "modified allocation optimization algorithms"
"modified choosing optimizer algorithms" » "modified choosing optimized algorithms", "modified choosing optimized algorithm", "modified choosing optimization algorithms", "modified caging optimizer algorithms"

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 choosing optimizer algorithms\") OR (\"modified allocation approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified choosing optimizer algorithms ) OR ( modified allocation approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified choosing optimizer algorithms") OR ("modified allocation approximation algorithms"))*.