Perhaps you should try some spelling variations:
"coder precoder unit linear programming" » "coder decoder unit linear programming" (Expand search), "coder recovery unit linear programming" (Expand search), "coder precoder units linear programming" (Expand search), "coder precoder not linear programming" (Expand search), "coder precoder finito 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)

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 unit linear programming") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder precoder unit linear programming\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder precoder unit linear programming ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder precoder unit linear programming") OR ("api python python python programming"))*.