Perhaps you should try some spelling variations:
"_ python tutor python programming" » "_ python to python programming" (Expand search), "_ python theory python programming" (Expand search), "_ python tool python programming" (Expand search), "_ python piton python programming" (Expand search)
"coder coder using linear programming" » "coder decoder using linear programming" (Expand search), "code code using linear programming" (Expand search), "decoder codec using linear programming" (Expand search), "coder coders using linear programming" (Expand search), "coder cover using linear programming" (Expand search), "coder code using linear 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 using linear programming") OR ("_ python tutor python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder using linear programming\") OR (\"_ python tutor python programming\"))".
• Removing quotes may allow a broader search: (( coder coder using linear programming ) OR ( _ python tutor python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder using linear programming") OR ("_ python tutor python programming"))*.