Perhaps you should try some spelling variations:
teaching change » teaching chinese, teaching chapter, teaching china
change robert » change roberto, chase robert, chang roberto
time lost » time cost, time loss, time list
time last » time list, time past, time class
ying jin » jing ji, yang jie
yang jin » yang jie, yang jun, shang jin
robert n » robert _, robert e, robert j

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 jin) OR (yang jin)) ((time last) OR (time lost)) teaching change robert n ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tan ((ying jin) or (yang jin)) ((time last) OR (time lost)) teaching change robert n ;~".
• Adding a wildcard symbol may retrieve word variants: tan ((ying jin) or (yang jin)) ((time last) OR (time lost)) teaching change robert n ;*.