Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
pre algorithm » mppt algorithm, qspr algorithm, _ algorithm
modified qoe » modified male, modified _, modified df
modified bi1 » modified _
using pre » nursing pre, using one, using ph
code » core

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( code using pre algorithm ) or ( ((modified qoe) OR (modified bi1)) optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( code using pre algorithm ) OR ( ((modified qoe) OR (modified bi1)) optimization algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( code using pre algorithm ) or ( ((modified qoe) OR (modified bi1)) optimization algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( code using pre algorithm ) or ( ((modified qoe) OR (modified bi1)) optimization algorithm ))*.