Perhaps you should try some spelling variations:
"coder coder theory models problems" » "coder coder theory models problemas" (Expand search), "coder coder theory model problems" (Expand search), "coder coder theory model problem" (Expand search), "coder code theory models problems" (Expand search), "coder codes theory models problems" (Expand search), "coder modern theory models problems" (Expand search), "coder decoder theory models problems" (Expand search), "code code theory models problems" (Expand search), "decoder codec theory models 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 theory models problems\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder theory models problems ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder theory models problems") OR ("api python python python programming"))*.