Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
df optimisation » _ optimisation, _ optimization, qoe optimization
modified df » modified _, modified adam, modified bi1
using open » using opencl
using one » using pre, using online
code » core

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: (( code ((using one) OR (using open)) algorithm ) OR ( modified df optimisation algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( code ((using one) OR (using open)) algorithm ) or ( modified df optimisation algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( code ((using one) OR (using open)) algorithm ) or ( modified df optimisation algorithm ))*.