Perhaps you should try some spelling variations:
estimates using » estimation using
states using » states during, rates using, studies using
ying yang » yang yang, yin yang, ying chang
yang eine » yang jie, yang jin, yang jing
eine art » fine art, fine arts, eine auf
yu wang » yue wang, yu fang, yu gang

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: ((ying yang) OR (yu wang)) yang eine art ((states using) OR (estimates using)) dhm bei ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ying yang) or (yu wang)) yang eine art ((states using) OR (estimates using)) dhm bei ;~".
• Adding a wildcard symbol may retrieve word variants: ((ying yang) or (yu wang)) yang eine art ((states using) OR (estimates using)) dhm bei ;*.