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