Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh tri » thanh tri, hanh tai, hanh trinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau treo
te sac » te sach, te cac, te san
loc va » hoc va, luc va
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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 sac ky lang xa hoi. hieu va cam ((tuc va) OR (loc va)) hanh tri ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh tri ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh tri ((cuu tre) OR (cau tren))*.