Perhaps you should try some spelling variations:
"coder coder complex teaching subject" » "coder coder complexity teaching subject" (Expand search), "coder coder computer teaching subject" (Expand search), "coder coder complex training subject" (Expand search), "coder copper complex teaching subject" (Expand search), "coder holder complex teaching subject" (Expand search), "coder modern complex teaching subject" (Expand search), "coder decoder complex teaching subject" (Expand search), "code code complex teaching subject" (Expand search), "decoder codec complex teaching 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 complex teaching subject") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder complex teaching subject\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder complex teaching subject ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder complex teaching subject") OR ("on python python python programming"))*.