Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
bieu hieu » bieu hien, tieu bieu, bien kieu
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
hieu ca » hieu cac, hieu cua, hieu va
lao van » dao van, cao van, lo van
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, v nang, may nang
ca lao » cua lao, ca dao, ca cao
dich » dinh

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 ((y nang) OR (ly nang)) xa hoi. bieu hieu ca lao van dich vu ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ly nang)) xa hoi. bieu hieu ca lao van dich vu ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) xa hoi. bieu hieu ca lao van dich vu ((cua tre) or (cua triet))*.