Perhaps you should try some spelling variations:
"coder coder subspace ordering problem" » "coder coder surface ordering problem" (Expand search), "coder coder subspace indexing problem" (Expand search), "coder coder subspace tracking problem" (Expand search), "coder coder subspace rostering problem" (Expand search), "coder coder subspace covering problem" (Expand search), "coder coder subspace covering problems" (Expand search), "coder decoder subspace ordering problem" (Expand search), "code code subspace ordering problem" (Expand search), "decoder codec subspace ordering 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 subspace ordering problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder subspace ordering problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder subspace ordering problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder subspace ordering problem") OR ("_ python python python programming"))*.