Perhaps you should try some spelling variations:
"coder coder using sample problems" » "coder coder using sample problem" (Expand search), "coder coder using same problems" (Expand search), "coder coder using simple problema" (Expand search), "coder coder using samples problems" (Expand search), "coder coder using simple problems" (Expand search), "coder coder using simplex problems" (Expand search), "coder decoder using sample problems" (Expand search), "code code using sample problems" (Expand search), "decoder codec using sample problems" (Expand search), "coder coders using sample problems" (Expand search), "coder cover using sample problems" (Expand search), "coder code using sample problems" (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 coder using sample problems") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder using sample problems\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder using sample problems ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder using sample problems") OR ("on python python python programming"))*.