Perhaps you should try some spelling variations:
teaching change » teaching chinese, teaching chapter, teaching china
change robert » change roberto, chase robert, chang roberto
robert bin » robert b, robert n, robert i
time last » time list, time past, time class
time lost » time cost, time loss, time list
tan yang » dan yang, tan ying, tan yong
yang i » yang di, yang xi, yang yi

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 yang i ((time last) OR (time lost)) teaching change robert bin ;~.
• Adding a wildcard symbol may retrieve word variants: tan yang i ((time last) or (time lost)) teaching change robert bin ;*.