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