Perhaps you should try some spelling variations:
"modified lighting estimation algorithms" » "modified lighting estimation algorithm", "modified lighting optimization algorithms", "modified lighting optimisation algorithm", "modified caging estimation algorithms"
"modified objective solution algorithm" » "modified objective evolutionary algorithm", "modified objective allocation algorithm", "modified objective evolution algorithm", "modified objective convolution algorithms"

Try widening your search to All Fields.

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