Perhaps you should try some spelling variations:
"coder coder concentration in programming" » "coder copper concentration in programming" (Expand search), "coder powder concentration in programming" (Expand search), "coder power concentration in programming" (Expand search), "coder coder concentration and programming" (Expand search), "coder coder concentration _ programming" (Expand search), "coder coder concentration c programming" (Expand search), "coder decoder concentration in programming" (Expand search), "code code concentration in programming" (Expand search), "decoder codec concentration in 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 coder concentration in programming") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder concentration in programming\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder concentration in programming ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder concentration in programming") OR ("api python python python programming"))*.