Perhaps you should try some spelling variations:
"coder coder about semidefinite programming" » "coder coder and semidefinite programming" (Expand search), "coder coder on semidefinite programming" (Expand search), "coder coder set semidefinite programming" (Expand search), "coder decoder about semidefinite programming" (Expand search), "code code about semidefinite programming" (Expand search), "decoder codec about semidefinite programming" (Expand search), "coder codes about semidefinite programming" (Expand search), "coder folder about semidefinite programming" (Expand search), "coder model about semidefinite programming" (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 about semidefinite programming") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder about semidefinite programming\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder about semidefinite programming ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder about semidefinite programming") OR ("_ python python python programming"))*.