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 n » robert _, robert e, robert j
dan yang » daun yang, tan yang, wang yang
yang yi » yang di, yang xi, yang jui

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 yi ((time last) OR (time lost)) teaching change roberto n ;~.
• Adding a wildcard symbol may retrieve word variants: dan yang yi ((time last) or (time lost)) teaching change roberto n ;*.