Perhaps you should try some spelling variations:
"coder coder _ testing problem" » "coder coder _ nesting problem" (Expand search), "coder coder _ nesting problems" (Expand search), "coder coder _ eating problem" (Expand search), "coder decoder _ testing problem" (Expand search), "code code _ testing problem" (Expand search), "decoder codec _ testing 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.

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