Perhaps you should try some spelling variations:
"coder coder decoder school subject" » "coder coder gender school subject" (Expand search), "coder coder elder school subject" (Expand search), "coder coder leader school subject" (Expand search), "coder coder decoder school subjects" (Expand search), "coder encoder decoder school subject" (Expand search), "code code decoder school subject" (Expand search), "decoder codec decoder school subject" (Expand search), "codesc poder decoder school subject" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ 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 decoder school subject") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder decoder school subject\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder decoder school subject ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder decoder school subject") OR ("on python python python programming"))*.