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