Perhaps you should try some spelling variations:
teaching change » teaching chinese, teaching chapter, teaching china
thing change » things change, using change, getting change
robert bin » robert b, robert n, robert i
time last » time list, time past, time lost
wang yang » wang yan, wang liang, wang yanling
dan yang » daun yang, tan yang, yang yang
yi time » ii time, i time, iii 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: ((dan yang) OR (wang yang)) yi time last ((thing change) OR (teaching change)) robert bin ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dan yang) or (wang yang)) yi time last ((thing change) OR (teaching change)) robert bin ;~".
• Adding a wildcard symbol may retrieve word variants: ((dan yang) or (wang yang)) yi time last ((thing change) OR (teaching change)) robert bin ;*.