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