Perhaps you should try some spelling variations:
"coder coder sampling open problems" » "coder under sampling open problems" (Expand search), "coder over sampling open problems" (Expand search), "coder core sampling open problems" (Expand search), "coder coder sampling on problems" (Expand search), "coder coder sampling event problems" (Expand search), "coder coder sampling of problems" (Expand search), "coder decoder sampling open problems" (Expand search), "code code sampling open problems" (Expand search), "decoder codec sampling open problems" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sampling open problems\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder sampling open problems ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder sampling open problems") OR ("api python python python programming"))*.