Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
chao tu » chao xu, cho tu, cao tu
ve chao » ve chat, ve cham, ve cho
su sach » so sach, vu sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu ve » hieu va, hieu van
va va » va van, va vai, va vat

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 ((ty nang) OR (ty hang)) xa hoi. hieu ve chao tu va hanh ((va va) OR (va vua)) thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty hang)) xa hoi. hieu ve chao tu va hanh ((va va) or (va vua)) thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ty hang)) xa hoi. hieu ve chao tu va hanh ((va va) or (va vua)) thiet*.