Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
truc ban » thuc ban, truc dan, truc van
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
lang ha » long ha
van cau » van dau, van hau, van chat
ky lang » ky nang, ky dang, ky tang
hanh de » hanh ve, hanh kem
cua tre » cua te, cua triet, dua tren
cuu tre » cau treo
ha hoi » hoa hoi, ha noi, xa hoi
sai ky » sac ky
te sai » te tai, te bai, te lai

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 sai ky lang ha hoi. hieu van cau truc ban hanh de ((cua tre) OR (((cuu tre) OR (cau tren))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky lang ha hoi. hieu van cau truc ban hanh de ((cua tre) or (((cuu tre) OR (cau tren))))~".
• Adding a wildcard symbol may retrieve word variants: te sai ky lang ha hoi. hieu van cau truc ban hanh de ((cua tre) or (((cuu tre) OR (cau tren))))*.