Perhaps you should try some spelling variations:
luoc van » luoc can, luoc va, luc van
hanh tai » thanh tai, hang tai, han tai
nuoc van » nuoc va, nuoc san, nuoc dan
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
o lai » o lao

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 sac ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh tai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh tai ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh tai ((cua tre) or (cuu tre))*.