Perhaps you should try some spelling variations:
"modified passive optimized algorithmss" » "modified passive optimized algorithms", "modified passive optimized algorithm", "modified passive optimizer algorithms", "modified adaptive optimized algorithmss"
"modified parameters estimation algorithm" » "modified parameter estimation algorithm", "modified parameter estimates algorithm", "modified parameter optimization 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 passive optimized algorithmss") or ("modified parameters estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified passive optimized algorithmss") OR ("modified parameters estimation algorithm")).
• Removing quotes may allow a broader search: (( modified passive optimized algorithmss ) or ( modified parameters estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified passive optimized algorithmss") or ("modified parameters estimation algorithm"))*.