Perhaps you should try some spelling variations:
sampling designs » sampling design, sample design, sampling sites
light sampling » light damping, first sampling, ghg sampling
twinn ian » wing ian
dong sign » dong sin, among sign
ian yang » dan yang, tan yang, wang yang
di light » iii light, ria light, _ light
dong bin » dong sin, dann bin
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 di light sampling designs ((((dong bin) OR (dong di))) OR (dong sign)) ;~.
• Adding a wildcard symbol may retrieve word variants: twinn ian yang di light sampling designs ((((dong bin) or (dong di))) or (dong sign)) ;*.