Perhaps you should try some spelling variations:
teaching change » teaching chinese, teaching chapter, teaching china
change roberto » chang roberto, change robert, echandi roberto
time last » time list, time past, time class
time lost » time cost, time loss, time list
roberto e » robert e, roberto n, roberto f
tan yang » dan yang, tan ying, tan yong
fan ying » fan xing, ran ying, tan ying

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