Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
df optimization » _ optimization, qoe optimization, _ optimisation
mom algorithm » adam algorithm, mppt algorithm, _ algorithm
mode control » case control
modified df » modified _, modified adam, modified bi1

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

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