Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, thanh dat
vanh dai » van dai, vanh tai, lanh dao
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
ma hoi » mai hoi, xa hoi, ma hoa

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 bai ky tang ma hoi. hieu su cham ((xuc van) OR (duc tan)) ((hanh dai) OR (vanh dai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky tang ma hoi. hieu su cham ((xuc van) or (duc tan)) ((hanh dai) OR (vanh dai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu bai ky tang ma hoi. hieu su cham ((xuc van) or (duc tan)) ((hanh dai) OR (vanh dai)) cua tre*.