Perhaps you should try some spelling variations:
linear state » linear system
wang liang » wang yang
dong skin » dong sin, dong bin, dof skin
brain a » brain _, brains _
train a » train _
state 2 » state _, state a, state 4
get a » get _
et a » et al, et la, e 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: ((wang liang) OR (dong skin)) ((et a) OR (get a)) ((brain a) OR (train a)) linear state 2 ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang liang) or (dong skin)) ((et a) or (get a)) ((brain a) OR (train a)) linear state 2 ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (dong skin)) ((et a) or (get a)) ((brain a) OR (train a)) linear state 2 ;*.