Perhaps you should try some spelling variations:
"coder coder sampling tree problems" » "coder under sampling tree problems" (Expand search), "coder over sampling tree problems" (Expand search), "coder core sampling tree problems" (Expand search), "coder coder sampling free problems" (Expand search), "coder coder sampling time problems" (Expand search), "coder coder sampling area problems" (Expand search), "coder coder sampling three problems" (Expand search), "coder coder sampling tree problem" (Expand search), "coder coder sampling the problems" (Expand search), "coder decoder sampling tree problems" (Expand search), "code code sampling tree problems" (Expand search), "decoder codec sampling tree problems" (Expand search)
"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)

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