Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified caging estimation algorithms" » "modified caging optimization algorithms", "modified caging optimisation algorithm", "modified caging approximation algorithms", "modified lighting estimation algorithms"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified caging estimation algorithms") or ("modified multiobjective estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified caging estimation algorithms") OR ("modified multiobjective estimation algorithm"))*.
• Removing quotes may allow a broader search: (( modified caging estimation algorithms ) or ( modified multiobjective estimation algorithm ))*.