Perhaps you should try some spelling variations:
sampling designs » sampling design, sample design, sampling sites
ghg sampling » log sampling, light sampling, grab sampling
among asian » among african, among iranian, among latvian
twinn ian » wing ian
ian yang » dan yang, tan yang, wang yang
dann bin » dong bin
yang ai » yang di, yang xi, yang yi
dong di » dong sin

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: twinn ian yang ai ghg sampling designs ((((dann bin) OR (dong di))) OR (among asian)) ;~.
• Adding a wildcard symbol may retrieve word variants: twinn ian yang ai ghg sampling designs ((((dann bin) or (dong di))) or (among asian)) ;*.