Perhaps you should try some spelling variations:
"coder coder tree based problems" » "coder coder tree posed problems" (Expand search), "coder coder tree based probes" (Expand search), "coder coder tree basic problems" (Expand search), "coder decoder tree based problems" (Expand search), "code code tree based problems" (Expand search), "decoder codec tree based problems" (Expand search), "coder modern tree based problems" (Expand search), "coder under tree based problems" (Expand search), "coder poder tres based 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 tree based problems") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder tree based problems\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder tree based problems ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder tree based problems") OR ("api python python python programming"))*.