Perhaps you should try some spelling variations:
"coder coder optical diffraction problem" » "coder coder dynamical diffraction problem" (Expand search), "coder coder optical diffusion problem" (Expand search), "coder coder optical bifurcation problem" (Expand search), "coder coder optical interaction problem" (Expand search), "coder code optical diffraction problem" (Expand search), "coder order optical diffraction problem" (Expand search), "coder mode optical diffraction problem" (Expand search), "coder decoder optical diffraction problem" (Expand search), "code code optical diffraction problem" (Expand search), "decoder codec optical diffraction problem" (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder optical diffraction problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder optical diffraction problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder optical diffraction problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder optical diffraction problem") OR ("api python python python programming"))*.