Perhaps you should try some spelling variations:
teaching change » teaching chinese, teaching chapter, teaching china
getting change » putting change, detecting change, creating change
robert bin » robert b, robert n, robert i
time last » time list, time past, time lost
tan yang » dan yang, tan yong, tao yang
tan ying » fan ying, ran ying, tan yong
i time » ii time, 3 time, 4 time

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