Perhaps you should try some spelling variations:
lasten teaching » based teaching, stem teaching, content teaching
teaching chang » teaching change, teaching china, teaching chunks
roberto i » robert i, roberto f, roberto j
roberto n » robert _, robert e, robert j
ran ying » fan ying, tan ying, jin ying
di die » die die, vi die, xi die

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ran ying ((di die) OR (ii die)) lasten teaching chang ((roberto i) OR (roberto n)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ran ying ((di die) or (ii die)) lasten teaching chang ((roberto i) OR (roberto n)) ;~".
• Adding a wildcard symbol may retrieve word variants: ran ying ((di die) or (ii die)) lasten teaching chang ((roberto i) OR (roberto n)) ;*.