Perhaps you should try some spelling variations:
"coder coder dog external problem" » "coder coder dog external problems" (Expand search), "coder coder dog internal problems" (Expand search), "coder coder dog extremal problem" (Expand search), "coder coder dogs external problem" (Expand search), "coder coder dc external problem" (Expand search), "coder coder ufcg external problem" (Expand search), "coder decoder dog external problem" (Expand search), "code code dog external problem" (Expand search), "decoder codec dog external problem" (Expand search), "coder boxer dog external problem" (Expand search)
"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)

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