Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
pre algorithm » mppt algorithm, qspr algorithm, _ algorithm
modified adam » modified near
modified df » modified _, modified bi1
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 adam) OR (modified df)) optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( code using pre algorithm ) OR ( ((modified adam) OR (modified df)) optimisation algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( code using pre algorithm ) or ( ((modified adam) OR (modified df)) optimisation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( code using pre algorithm ) or ( ((modified adam) OR (modified df)) optimisation algorithm ))*.