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
sach ky » sac ky, sach y, sach ty
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
so viet » hoc viet
nam tu » nam thu, nam thuc
x hoi » xa hoi, o hoi, x ho
ve so » ve su, va so, ve co

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: vu sach ky nang x hoi. hieu van nam tu ((ban hanh) OR (((va danh) OR (va dinh)))) ve so viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu van nam tu ((ban hanh) or (((va danh) OR (va dinh)))) ve so viet~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu van nam tu ((ban hanh) or (((va danh) OR (va dinh)))) ve so viet*.