Perhaps you should try some spelling variations:
"modified bi1 optimisation algorithms" » "modified bi1 optimisation algorithm", "modified bi1 optimization algorithms", "modified bi1 estimation algorithms", "modified _ optimisation algorithms", "modified _ optimization algorithms", "modified qoe optimization algorithms"
"modified objective estimation algorithm" » "modified objective optimization algorithm", "modified objective allocation 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 estimation algorithm") OR ("modified bi1 optimisation algorithms"))~.
• Removing quotes may allow a broader search: (( modified objective estimation algorithm ) or ( modified bi1 optimisation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective estimation algorithm") or ("modified bi1 optimisation algorithms"))*.