Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
method algorithm » mom algorithm
modified adam » modified near
using method » nursing methods, focusing method, using metal
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 method algorithm ) or ( ((modified adam) OR (modified df)) approximation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( code using method algorithm ) OR ( ((modified adam) OR (modified df)) approximation algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( code using method algorithm ) or ( ((modified adam) OR (modified df)) approximation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( code using method algorithm ) or ( ((modified adam) OR (modified df)) approximation algorithm ))*.