Perhaps you should try some spelling variations:
"coder coder sparse optimization problem" » "coder coder sparse optimization problems" (Expand search), "coder coder space optimization problem" (Expand search), "coder coder shape optimization problem" (Expand search), "coder coder scale optimization problem" (Expand search), "coder over sparse optimization problem" (Expand search), "coder under sparse optimization problem" (Expand search), "coder novel sparse optimization problem" (Expand search), "coder decoder sparse optimization problem" (Expand search), "code code sparse optimization problem" (Expand search), "decoder codec sparse optimization problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python 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 sparse optimization problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sparse optimization problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder sparse optimization problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder sparse optimization problem") OR ("api python python python programming"))*.