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