Perhaps you should try some spelling variations:
"coder coder _ multiclass problems" » "coder coder _ multiplos problemas" (Expand search), "coder decoder _ multiclass problems" (Expand search), "code code _ multiclass problems" (Expand search), "decoder codec _ multiclass 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.

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