Perhaps you should try some spelling variations:
ve triet » va trien, su triet
dung sai » dung tai, dung va, dung dat
te sach » toc sach
va dung » van dung, va duong, vat dung
cua duc » cua tuc, cua nuoc, cua quoc
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

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 lang xa hoi. lieu ((va cam) OR (va cao)) xuc va dung sai ((ve triet) OR (cua duc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. lieu ((va cam) OR (va cao)) xuc va dung sai ((ve triet) or (cua duc))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. lieu ((va cam) OR (va cao)) xuc va dung sai ((ve triet) or (cua duc))*.