Perhaps you should try some spelling variations:
"modified lighting optimization algorithms" » "modified lighting optimisation algorithm", "modified lighting estimation algorithms", "modified lighting estimation algorithm", "modified staffing optimization algorithms", "modified caging optimization algorithms"
"modified learning methods algorithm" » "mobile learning methods algorithm", "modified caging methods algorithm", "modified nursing methods algorithm"

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