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