Perhaps you should try some spelling variations:
lasten teaching » based teaching, stem teaching, content teaching
change robert » change roberto, chase robert, zhang robert
chang roberto » chase robert
ran ying » fan ying, tan ying, jin ying
di die » die die, ii die, xi die
vi die » ii 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 (vi die)) lasten teaching ((change robert) OR (chang roberto)) bin ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ran ying ((di die) or (vi die)) lasten teaching ((change robert) OR (chang roberto)) bin ;~".
• Adding a wildcard symbol may retrieve word variants: ran ying ((di die) or (vi die)) lasten teaching ((change robert) OR (chang roberto)) bin ;*.