Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
so sach » so sanh, bo sach, co sach
nang xa » lang xa, nang ma, mang xa
sach ky » sac ky, sach y, sach ty
di cua » dai cua, doi cua, de cua
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang xa) OR (nang x)) hoi. hieu hien bach tuoc ((va danh) or (va hanh)) di cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang x)) hoi. hieu hien bach tuoc ((va danh) OR (va hanh)) di cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) OR (nang x)) hoi. hieu hien bach tuoc ((va danh) or (va hanh)) di cua su*".