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