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