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