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