Perhaps you should try some spelling variations:
optimisation algorithmss » optimization algorithms, estimation algorithm
optimisation algorithm » optimization algorithms, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
_ optimisation » _ optimization

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

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