Perhaps you should try some spelling variations:
"coder coder gray values problem" » "coder coder gray values problems" (Expand search), "coder coder gray values problema" (Expand search), "coder coder gray value problem" (Expand search), "coder decoder gray values problem" (Expand search), "code code gray values problem" (Expand search), "decoder codec gray values problem" (Expand search), "coder coder grau values problem" (Expand search), "coder coder gran values problem" (Expand search), "coder coder gram values problem" (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 gray values problem\") OR (\"_ python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder gray values problem ) OR ( _ python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder gray values problem") OR ("_ python python python programming"))*.