Perhaps you should try some spelling variations:
van quang » van quan, tran quang, van tuan
van nang » van ban, van dong, van dung
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van nang) OR (van quang)) x hoi. hieu ve cau truc van hanh de cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((van nang) OR (van quang)) x hoi. hieu ve cau truc van hanh de cua tre*.