Perhaps you should try some spelling variations:
"coder coder linear programing problem" » "coder coder linear programming problem" (Expand search), "coder coder linear programming problems" (Expand search), "coder coder linear program problem" (Expand search), "coder coder linear programmin problem" (Expand search), "coder code linear programing problem" (Expand search), "coder order linear programing problem" (Expand search), "coder model linear programing problem" (Expand search), "coder decoder linear programing problem" (Expand search), "code code linear programing problem" (Expand search), "decoder codec linear programing problem" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ python programming" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder linear programing problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder linear programing problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder linear programing problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder linear programing problem") OR ("on python python python programming"))*.