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