Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
nang doc » nang luc
cua tre » cua te, cuu tre, cua triet
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
sai ky » sac ky
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
nang o » nang co, nang ho, nang ro
tu sai » tu bai, tu san, tu cai

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: tu sai ky ((nang o) OR (nang doc)) hoi. hieu va chat ((xuc va) OR (luc va)) vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang o) or (nang doc)) hoi. hieu va chat ((xuc va) OR (luc va)) vanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang o) or (nang doc)) hoi. hieu va chat ((xuc va) OR (luc va)) vanh dai cua tre*.