Perhaps you should try some spelling variations:
"coder coder the subgroup problem" » "coder coder the subgraph problem" (Expand search), "coder coder the group problem" (Expand search), "coder coder the semigroup problem" (Expand search), "coder coder the subgenus problem" (Expand search), "coder coder _ subgroup problem" (Expand search), "coder decoder the subgroup problem" (Expand search), "code code the subgroup problem" (Expand search), "decoder codec the subgroup problem" (Expand search), "coder code the subgroup problem" (Expand search), "coder cover the subgroup problem" (Expand search), "coder poder the subgroup problem" (Expand search)
"monty python python python programming" » "monty pythons python python programming" (Expand search), "monty piton python python programming" (Expand search), "monty 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 the subgroup problem") OR ("monty python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder the subgroup problem\") OR (\"monty python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder the subgroup problem ) OR ( monty python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder the subgroup problem") OR ("monty python python python programming"))*.