Perhaps you should try some spelling variations:
"coder coder room allocation problem" » "coder coder room location problem" (Expand search), "coder coder random allocation problem" (Expand search), "coder coder cost allocation problem" (Expand search), "coder coder loss allocation problem" (Expand search), "coder decoder room allocation problem" (Expand search), "code code room allocation problem" (Expand search), "decoder codec room allocation problem" (Expand search), "coder under room allocation 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder room allocation problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder room allocation problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder room allocation problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder room allocation problem") OR ("_ python python python programming"))*.