Perhaps you should try some spelling variations:
"coder coder ward clustering problem" » "coder coder ward covering problem" (Expand search), "coder coder aware clustering problem" (Expand search), "coder coder and clustering problem" (Expand search), "coder coder based clustering problem" (Expand search), "coder decoder ward clustering problem" (Expand search), "code code ward clustering problem" (Expand search), "decoder codec ward 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.

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