Perhaps you should try some spelling variations:
machine problem » matching problem (Expand search), teaching problem (Expand search), teaching problems (Expand search)
coding machine » coating machine (Expand search), molding machine (Expand search), combing machine (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
odor coding » color coding (Expand search), odor binding (Expand search)
coder odor » odor odor (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( coder odor coding machine problem ) OR ( _ python python python programming ))~.