Perhaps you should try some spelling variations:
"coder coding _ basic coverage" » "coder coding _ based coverage" (Expand search), "coder coding _ brazil coverage" (Expand search), "coder coding _ dynamic coverage" (Expand search), "modern coding _ basic coverage" (Expand search), "color coding _ basic coverage" (Expand search), "odor coding _ basic coverage" (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 coding _ basic coverage") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coding _ basic coverage\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coding _ basic coverage ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coding _ basic coverage") OR ("on python python python programming"))*.