Perhaps you should try some spelling variations:
"modified allocation approximation algorithms" » "modified allocation optimization algorithms"
"modified global optimisation algorithm" » "modified global optimization algorithms", "modified global estimation algorithm", "modified global estimation algorithms", "modified global optimization 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 global optimisation algorithm\") OR (\"modified allocation approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified global optimisation algorithm ) OR ( modified allocation approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified global optimisation algorithm") OR ("modified allocation approximation algorithms"))*.