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