Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
adaptive optimization » objective optimization, adaptive quantization, static optimization
modified adaptive » modified passive
modified network » certified network, defined network, modified near

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified network approximation algorithm ) or ( modified adaptive optimization algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified network approximation algorithm ) OR ( modified adaptive optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( modified network approximation algorithm ) or ( modified adaptive optimization algorithms ))*.