Perhaps you should try some spelling variations:
"odor coding scheme _ program" » "odor trading scheme _ program" (Expand search), "color coding scheme _ program" (Expand search), "odor binding scheme _ program" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python python python programming" (Expand search), "manim python python python programming" (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 scheme _ program\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( odor coding scheme _ program ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("odor coding scheme _ program") OR ("api python python python programming"))*.