Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh cong » trinh dung
nganh hoa » thanh hoa, khanh hoa, danh hoa
cong thai » cong hai, hong thai, cong thanh
nganh co » nganh cong, nganh y, anh co
su sach » vu sach
so sach » so sanh, bo sach, co sach

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