Perhaps you should try some spelling variations:
small states » small scale
states using » states during, rates using, estimates using
yang yang » wang yang, wang yan
using dea » using dem, using dna, using delta
yu gang » xu gang, yi gang, yu fang
dea bei » der bei, drag bei
land a » land _, poland a

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 gang)) land a small states using dea bei ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (yu gang)) land a small states using dea bei ;*.