Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va

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 y nang ma hoi. hieu van cam xuc va hanh di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu van cam xuc va hanh di ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van cam xuc va hanh di ((cua tre) or (cua triet))*.