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