Perhaps you should try some spelling variations:
device concepts » service concepts, services concepts, revised concepts
teaching chang » teaching change, teaching china, teaching chunks
chang roberto » chase robert
die context » does context, sme context, device context
roberto bin » roberto n, roberto bola, roberto luis
tan ying » fan ying, ran ying, tan yang
ying vi » ying jin

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

• Performing a fuzzy search may retrieve terms with similar spellings: tan ying vi ((die context) or (device concepts)) teaching chang roberto bin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tan ying vi ((die context) OR (device concepts)) teaching chang roberto bin ;*.