Perhaps you should try some spelling variations:
"coder coder based clustering problem" » "coder coder based covering problem" (Expand search), "coder coder and clustering problem" (Expand search), "coder coder data clustering problem" (Expand search), "coder decoder based clustering problem" (Expand search), "code code based clustering problem" (Expand search), "decoder codec based clustering problem" (Expand search), "coder code based clustering problem" (Expand search), "coder foder based clustering problem" (Expand search), "coder codec based clustering 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 based clustering problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder based clustering problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder based clustering problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder based clustering problem") OR ("api python python python programming"))*.