Perhaps you should try some spelling variations:
nam trung » nam trong, tai trung, ba trung
cua viet » ca viet, hoa viet, cua vat
nha hanh » nhat hanh, nha thanh, nha lanh
vai cua » dai cua, hai cua, lai cua
ha hanh » ha thanh, ha anh, va hanh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ha dong » hoat dong, van dong
va dong » van dong, xa dong, lao dong
va nam » van nam, ha nam, va nay

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 ((va dong) OR (ha dong)) xa hoi. hieu va nam trung ((ha hanh) OR (nha hanh)) vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((va dong) OR (ha dong)) xa hoi. hieu va nam trung ((ha hanh) or (nha hanh)) vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((va dong) OR (ha dong)) xa hoi. hieu va nam trung ((ha hanh) or (nha hanh)) vai cua viet*.