Perhaps you should try some spelling variations:
"coder coder superstring in problem" » "coder closed superstring in problem" (Expand search), "coder open superstring in problem" (Expand search), "coder some superstring in problem" (Expand search), "coder coder superstrings and problem" (Expand search), "coder decoder superstring in problem" (Expand search), "code code superstring in problem" (Expand search), "decoder codec superstring in 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 superstring in problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder superstring in problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder superstring in problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder superstring in problem") OR ("_ python python python programming"))*.