Perhaps you should try some spelling variations:
"coder coder learning tree problems" » "coder codes learning tree problems" (Expand search), "coder modern learning tree problems" (Expand search), "coder model learning tree problems" (Expand search), "coder coder learning three problems" (Expand search), "coder coder learning trree problems" (Expand search), "coder coder learning free problems" (Expand search), "coder coder learning tree problem" (Expand search), "coder coder learning the problems" (Expand search), "coder decoder learning tree problems" (Expand search), "code code learning tree problems" (Expand search), "decoder codec learning 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)

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