Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
te sach » toc sach
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xac va » tac va, ac va, bac va
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: te sach y nang x hoi. hieu va cam ((xac va) OR (duc va)) vanh dai ((cua tre) OR (cua te))~.
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu va cam ((xac va) or (duc va)) vanh dai ((cua tre) or (cua te))*.