Perhaps you should try some spelling variations:
"coder precoder simple linear program" » "coder decoder simple linear program" (Expand search), "coder precoder simple linear programmin" (Expand search), "coder precoder simple linear programming" (Expand search), "coder precoder simples linear program" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons python 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 precoder simple linear program") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder precoder simple linear program\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder precoder simple linear program ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder precoder simple linear program") OR ("_ python python python programming"))*.