Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms (Expand search)
coder approximation » power approximation (Expand search), order approximation (Expand search), model approximation (Expand search)
algorithm duration » algorithm education (Expand search), algorithmic curation (Expand search), algorithm derivation (Expand search)
duration and » maturation and (Expand search), duration of (Expand search)
using coding » using coping (Expand search), using coating (Expand search), using cooking (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( coder approximation algorithm duration AND ) OR ( using coding _ python programming ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( coder approximation algorithm duration and ) OR ( using coding _ python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder approximation algorithm duration and ) OR ( using coding _ python programming ))*.