Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
co duc » co duoc, cao duc, do duc
x hoi » xa hoi, o hoi, x ho
va co » vo co

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

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