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