Perhaps you should try some spelling variations:
"coder coder sampling by problems" » "coder under sampling by problems" (Expand search), "coder over sampling by problems" (Expand search), "coder core sampling by problems" (Expand search), "coder decoder sampling by problems" (Expand search), "code code sampling by problems" (Expand search), "decoder codec sampling by problems" (Expand search), "coder coder sampling _ problems" (Expand search), "coder coder sampling in problems" (Expand search), "coder coder sampling bias problems" (Expand search), "coder coder sampling body problems" (Expand search), "coder coder sampling and 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 sampling by problems") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sampling by problems\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder sampling by problems ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder sampling by problems") OR ("on python python python programming"))*.