Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
bach nuoc » bach tuoc, sach nuoc, bich ngoc
hoc sach » hoc sinh, hoc cac, hoc anh
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
co sach » bo sach, cuon sach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (hoc sach)) ky nang ma hoi. hieu hien bach nuoc ((va danh) OR (va dan)) vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (hoc sach)) ky nang ma hoi. hieu hien bach nuoc ((va danh) OR (va dan)) vai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (hoc sach)) ky nang ma hoi. hieu hien bach nuoc ((va danh) OR (va dan)) vai cua tu*".