Perhaps you should try some spelling variations:
content teaching » context teaching, content matching, content teachers
lasten teaching » based teaching, stem teaching, related teaching
change robert » change roberto, chase robert, chang roberto
robert bin » robert b, robert n, robert i
tan ying » fan ying, ran ying, tan yang

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: tan ying ((die die) OR (wie die)) ((lasten teaching) OR (content teaching)) change robert bin ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tan ying ((die die) OR (wie die)) ((lasten teaching) or (content teaching)) change robert bin ;~".
• Adding a wildcard symbol may retrieve word variants: tan ying ((die die) OR (wie die)) ((lasten teaching) or (content teaching)) change robert bin ;*.