Perhaps you should try some spelling variations:
"modified channel estimation algorithmss" » "modified channel estimation algorithms", "modified channel estimation algorithm", "modified channel optimization algorithms", "modified channel excitation algorithmss"
"modified objective allocation algorithm" » "modified objective estimation algorithm", "modified objective evolution algorithm", "modified objective predation algorithm"

You may be able to get more results by adjusting your search query.

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