Perhaps you should try some spelling variations:
dua tren » dung tren
dang xay » dang van, van xay
ban hanh » ban hang
cuu tre » cua tre, cau tren, cau treo
duc ban » duc tan, duc van, dua ban
hanh de » hanh ve, hanh kem
chu duc » thu duc, chua duoc, cuu duoc
hieu ke » hieu kem, chieu ke, hieu ky
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sai ky » sac ky
ke chu » kem chu, ke chiu, ke cau
te sai » te tai, te bai, te lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky dang xay hoi. hieu ke chu duc ban hanh de ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky dang xay hoi. hieu ke chu duc ban hanh de ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sai ky dang xay hoi. hieu ke chu duc ban hanh de ((dua tren) or (cuu tre))*.