Perhaps you should try some spelling variations:
"coder precoder _ linear programing" » "coder precoder _ linear programming" (Expand search), "coder precoder _ linear programmin" (Expand search), "coder precoder _ linear program" (Expand search), "coder decoder _ linear programing" (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 precoder _ linear programing") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder precoder _ linear programing\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder precoder _ linear programing ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder precoder _ linear programing") OR ("api python python python programming"))*.