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