Perhaps you should try some spelling variations:
teaching china » teaching doing
class teaching » class teachers, class teacher, classroom teaching
time class » five class, site class, time case
sein time » sein die, sein eine, den time
roberto n » robert _, robert e, robert a
tan ying » ran ying, tan yang, tan yong
fan ying » fan xing, ran ying, jin ying
robert j » robert _, robert e

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) OR (fan ying)) sein time class teaching china ((roberto n) OR (robert j)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tan ying) or (fan ying)) sein time class teaching china ((roberto n) OR (robert j)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((tan ying) or (fan ying)) sein time class teaching china ((roberto n) OR (robert j)) ;*.