Perhaps you should try some spelling variations:
sach nang » cach mang, sach dung, sach danh
nang nang » nang sang, nang hang, chang nang
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
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 nang nang x hoi. hieu ve cau truc ((van hanh) OR (ban hanh)) de ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach nang nang x hoi. hieu ve cau truc ((van hanh) OR (ban hanh)) de ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach nang nang x hoi. hieu ve cau truc ((van hanh) OR (ban hanh)) de ((cua tre) or (cua te))*.