Perhaps you should try some spelling variations:
sampling using » sampling during, sampling testing, sampling units
ghg sampling » log sampling, light sampling, grab sampling
twinn ian » wing ian
dong sign » dong sin, among sign
ian yang » dan yang, tan yang, wang yang
dong bin » dong sin, dann 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "twinn ian yang ai ghg sampling using ((((dong bin) OR (dong di))) OR (dong sign)) ;~".
• Adding a wildcard symbol may retrieve word variants: twinn ian yang ai ghg sampling using ((((dong bin) OR (dong di))) OR (dong sign)) ;*.