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