Perhaps you should try some spelling variations:
"coder coder state estimation problems" » "coder coder state estimation problem" (Expand search), "coder coder state optimization problems" (Expand search), "coder coder state optimisation problems" (Expand search), "coder decoder state estimation problems" (Expand search), "code code state estimation problems" (Expand search), "decoder codec state estimation problems" (Expand search), "coder code state estimation problems" (Expand search), "coder modern state estimation problems" (Expand search), "coder border state estimation 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), "manim 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 state estimation problems") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder state estimation problems\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder state estimation problems ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder state estimation problems") OR ("api python python python programming"))*.