Perhaps you should try some spelling variations:
states using » states during, rates using, estimates using
small states » small scale
yang yang » wang yang, wang yan
yang take » land take
using dhm » using dem, using ddms, using dhcp
can take » can make, land take
yu yang » du yang, yi yang, yu fang

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