Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ban hanh » ban hang
cau treo » cau theo, cau triet, cau trieu
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
cuu tre » cua tre
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cam dua » ca dua, cay dua, chay dua
van cam » van nam, van lam, van cau
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
dua ban » dia ban, cua ban, qua ban

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 ky sang tao hoi. hieu van cam dua ban hanh dai ((cuu tre) OR (((cau treo) OR (cau tren))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang tao hoi. hieu van cam dua ban hanh dai ((cuu tre) or (((cau treo) OR (cau tren))))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang tao hoi. hieu van cam dua ban hanh dai ((cuu tre) or (((cau treo) OR (cau tren))))*.