Perhaps you should try some spelling variations:
nang nang » nang sang, nang hang, chang nang
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su sach » so sach
cua tre » cuu tre, cua triet, dua tren
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
vu sach » vu bach, vu khach
ve cau » ke cau, va cau, ve cac
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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