Perhaps you should try some spelling variations:
"coder coder based sample problems" » "coder coder based sample problem" (Expand search), "coder coder based same problems" (Expand search), "coder coder based simple problema" (Expand search), "coder coder and sample problems" (Expand search), "coder decoder based sample problems" (Expand search), "code code based sample problems" (Expand search), "decoder codec based sample problems" (Expand search), "coder code based sample problems" (Expand search), "coder foder based sample problems" (Expand search), "coder codec based sample problems" (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 coder based sample problems\") OR (\"_ python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder based sample problems ) OR ( _ python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder based sample problems") OR ("_ python python python programming"))*.