Perhaps you should try some spelling variations:
small estimates » small states, sharp estimates, summary estimates
estimates using » estimation using
yang yang » wang yang, wang yan
using dea » using dem, using dna, using delta
yu fang » yu gang, yu wang, yu yang
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 fang)) land a small estimates using dea bei ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (yu fang)) land a small estimates using dea bei ;*.