Perhaps you should try some spelling variations:
"coder coding using cone sampling" » "coder coding using core sampling" (Expand search), "coder coding using one sampling" (Expand search), "coder coding using can sampling" (Expand search), "modern coding using cone sampling" (Expand search), "color coding using cone sampling" (Expand search), "odor coding using cone sampling" (Expand search), "coder loading using cone sampling" (Expand search), "coder modeling using cone sampling" (Expand search), "coder drying using cone sampling" (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 coding using cone sampling") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coding using cone sampling\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coding using cone sampling ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coding using cone sampling") OR ("api python python python programming"))*.