Perhaps you should try some spelling variations:
"coder coder _ constant problem" » "coder coder _ contact problem" (Expand search), "coder coder _ control problem" (Expand search), "coder coder _ constrained problems" (Expand search), "coder decoder _ constant problem" (Expand search), "code code _ constant problem" (Expand search), "decoder codec _ constant 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 _ constant problem") OR ("manim python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder _ constant problem\") OR (\"manim python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder _ constant problem ) OR ( manim python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder _ constant problem") OR ("manim python python python programming"))*.