Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
van lam » van nam
va danh » va dinh, va dan, va hanh
su viet » so viet
lam tu » nam tu, cam tu, dam tu
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. hieu van lam tu ((((ban hanh) or (va thanh))) or (va danh)) ve su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu van lam tu ((((ban hanh) OR (va thanh))) OR (va danh)) ve su viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu van lam tu ((((ban hanh) or (va thanh))) or (va danh)) ve su viet*.