Perhaps you should try some spelling variations:
change robert » change roberto, chase robert, zhang robert
chang roberto » chase robert
time last » time list, time past, time class
time lost » time cost, time loss, time list
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 robert) OR (chang roberto)) e ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dan yang yi ((time last) or (time lost)) teaching ((change robert) OR (chang roberto)) e ;~".
• Adding a wildcard symbol may retrieve word variants: dan yang yi ((time last) or (time lost)) teaching ((change robert) OR (chang roberto)) e ;*.