Perhaps you should try some spelling variations:
hieu dien » lieu dien, bieu dien, hieu hien
dien sach » dien anh
sach nuoc » sach duoc, cac nuoc, bach tuoc
cua triet » cua viet, su triet, va triet
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, dua tren
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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

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