Perhaps you should try some spelling variations:
"coder coder teach mathematical problems" » "coder coder teach mathematical problem" (Expand search), "coder coder teach mathematics problems" (Expand search), "coder coder teaching mathematical problems" (Expand search), "coder coder teachers mathematical problems" (Expand search), "coder decoder teach mathematical problems" (Expand search), "code code teach mathematical problems" (Expand search), "decoder codec teach mathematical problems" (Expand search)
"and python python python programming" » "and pythons python python programming" (Expand search), "and piton python python programming" (Expand search), "and pitons python python programming" (Expand search), "in python python python programming" (Expand search), "on python python python programming" (Expand search), "api python 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 coder teach mathematical problems") OR ("and python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder teach mathematical problems\") OR (\"and python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder teach mathematical problems ) OR ( and python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder teach mathematical problems") OR ("and python python python programming"))*.