Perhaps you should try some spelling variations:
first sampling » field sampling, first saving, light sampling
sampling using » sampling during, sampling testing, sampling units
ping wang » ping pong, hong wang
wang yang » wang yan, wang liang, wang yanling
dong skin » dong sin, dof skin
ai first » i first, ii first, mali first
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ping wang yang ai first sampling using ((((dong bin) or (dong di))) or (dong skin)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ping wang yang ai first sampling using ((((dong bin) OR (dong di))) OR (dong skin)) ;*.