Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
tang mai » tang ma, tang tai, lang mai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang mai hoi. hieu van cam tuc va hanh vai ((cua tre) or (((cua triet) or (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang mai hoi. hieu van cam tuc va hanh vai ((cua tre) OR (((cua triet) OR (su triet)))).
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang mai hoi. hieu van cam tuc va hanh vai ((cua tre) or (((cua triet) or (su triet))))*.