Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
va danh » va dinh, va dan, va hanh
su viet » so viet
cam thu » nam thu, cac thu, ca thu
y nang » ky nang, ly nang, v nang
va thu » va thuc, van thu, va tu
x hoi » xa hoi, o hoi, x ho
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 y nang x hoi. hieu van ((cam thu) or (va thu)) ((ban hanh) or (va danh)) ve su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x hoi. hieu van ((cam thu) OR (va thu)) ((ban hanh) OR (va danh)) ve su viet.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x hoi. hieu van ((cam thu) or (va thu)) ((ban hanh) or (va danh)) ve su viet*.