Perhaps you should try some spelling variations:
sach hang » sach han, sach nang, khach hang
cac nganh » hoc nganh
cong thai » cong hai, cong thanh, cong tac
hong thai » hong ha, hinh thai
nganh co » nganh cong, nganh hoa, nganh y
su sach » so sach, vu sach
vu cac » va cac, tu cac, ve cac

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: (( vu cac nganh co khi đong luc ) OR ( su sach hang ((cong thai) OR (hong thai)) đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( vu cac nganh co khi đong luc ) or ( su sach hang ((cong thai) OR (hong thai)) đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( vu cac nganh co khi đong luc ) or ( su sach hang ((cong thai) OR (hong thai)) đong luc ))*.