Perhaps you should try some spelling variations:
"classes using python python programming" » "classes during python python programming" (Expand search), "classes using pythons python programming" (Expand search), "classes using piton python programming" (Expand search), "classes using pitons python programming" (Expand search), "classes usando python python programming" (Expand search)
"odor coding in python computer" » "color coding in python computer" (Expand search), "odor binding in python computer" (Expand search), "odor coding rna python computer" (Expand search), "odor coding and python computer" (Expand search), "odor coding _ python computer" (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"odor coding in python computer\") OR (\"classes using python python programming\"))~".
• Removing quotes may allow a broader search: (( odor coding in python computer ) OR ( classes using python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("odor coding in python computer") OR ("classes using python python programming"))*.