Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang tai » hang tai, tang tai, sang tai
hoang xa » hoang ha, hoang va, hoang xuan
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, dua tren
cac tuc » cac toc, cac tu, cac tac
sach ly » sach y, sach lo, sach hay
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa

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: su ((sach ly) OR (sach ty)) hoang xa hoi. hieu va cac tuc va nang tai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ly) or (sach ty)) hoang xa hoi. hieu va cac tuc va nang tai ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach ty)) hoang xa hoi. hieu va cac tuc va nang tai ((cua tre) OR (cua triet))*.