Perhaps you should try some spelling variations:
change robert » change roberto, chase robert, chang roberto
using change » using exchange, putting change, sensing change
time lasten » time listen, die lasten, time latent
time last » time list, time past, time lost
tan yang » dan yang, tan ying, tan yong
robert i » 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 yang di ((time last) OR (time lasten)) using change robert i ;~.
• Adding a wildcard symbol may retrieve word variants: tan yang di ((time last) or (time lasten)) using change robert i ;*.