Perhaps you should try some spelling variations:
conventional diffusion » convection diffusion, rotational diffusion, dimensional diffusion
documentation basic » documentation basics, documentation based, documentation fast
documentation asia » documentation animal, documentation basics, documentation based
diffusion lima » diffusion limit, diffusion like, diffusion linear

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication ((documentation basic) or (documentation asia)) conventional diffusion lima~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication ((documentation basic) OR (documentation asia)) conventional diffusion lima.
• Adding a wildcard symbol may retrieve word variants: communication ((documentation basic) or (documentation asia)) conventional diffusion lima*.