Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hang tai » hang va
hanh dao » lanh dao, thanh dat, thanh dam
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau

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 ((hang tai) OR (dung tai)) hoi. hieu van cam duc ban hanh dao ((cua tre) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((hang tai) OR (dung tai)) hoi. hieu van cam duc ban hanh dao ((cua tre) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((hang tai) OR (dung tai)) hoi. hieu van cam duc ban hanh dao ((cua tre) or (su triet))*.