Perhaps you should try some spelling variations:
"coder coder channel packing problem" » "coder coder channel tracking problem" (Expand search), "coder coder channel spacing problem" (Expand search), "coder coder channel blocking problem" (Expand search), "coder coder channel planning problem" (Expand search), "coder codes channel packing problem" (Expand search), "coder adder channel packing problem" (Expand search), "coder color channel packing problem" (Expand search), "coder decoder channel packing problem" (Expand search), "code code channel packing problem" (Expand search), "decoder codec channel packing 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 channel packing problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder channel packing problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder channel packing problem ) OR ( api python python python programming ))*.