Perhaps you should try some spelling variations:
"coder coverage on teaching programming" » "coder coverage on teaching program" (Expand search), "code coverage on teaching programming" (Expand search), "cancer coverage on teaching programming" (Expand search), "center coverage on teaching programming" (Expand search), "coder coverage of teaching programming" (Expand search), "coder coverage in teaching programming" (Expand search), "coder coverage and teaching programming" (Expand search), "coder coverage en teaching programming" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coverage on teaching programming\") OR (\"_ python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coverage on teaching programming ) OR ( _ python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coverage on teaching programming") OR ("_ python python python programming"))*.