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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified lighting estimation algorithmss") or ("modified objective approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified lighting estimation algorithmss") OR ("modified objective approximation algorithms")).
• Removing quotes may allow a broader search: (( modified lighting estimation algorithmss ) or ( modified objective approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified lighting estimation algorithmss") or ("modified objective approximation algorithms"))*.