Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
load optimization » global optimization, qoe optimization, stage optimization
modified network » certified network, defined network, modified near
modified load » modified adam, modified near

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 load optimization algorithms ) OR ( modified network approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified load optimization algorithms ) or ( modified network approximation algorithms ))*.