Perhaps you should try some spelling variations:
"manim python python python programming" » "manim pythons python python programming" (Expand search), "manim piton python python programming" (Expand search), "manim pitons python python programming" (Expand search), "monty python python python programming" (Expand search), "api python python python programming" (Expand search)
"coder coder _ routing problem" » "coder decoder _ routing problem" (Expand search), "code code _ routing problem" (Expand search), "decoder codec _ routing problem" (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 _ routing problem") OR ("manim python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder _ routing problem\") OR (\"manim python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder _ routing problem ) OR ( manim python python python programming ))*.