Perhaps you should try some spelling variations:
"linear precoding c programming computing" » "linear precoding c programming computer" (Expand search), "linear precoding _ programming computing" (Expand search), "linear precoding cone programming computing" (Expand search), "linear precoding and programming computing" (Expand search), "linear precoating _ programming computing" (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: (("linear precoding c programming computing") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"linear precoding c programming computing\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( linear precoding c programming computing ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("linear precoding c programming computing") OR ("api python python python programming"))*.