Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cach » vien bach, vien cac, vien canh
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky danh » ky anh, ky dang
cach tu » cach thuc
hai cua » thai cua, dai cua, hoi cua
ca hoi » cau hoi, cua hoi, co hoi
tu van » tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky danh ((ca hoi) or (xa hoi)). hieu vien cach tu van hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky danh ((ca hoi) OR (xa hoi)). hieu vien cach tu van hanh hai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky danh ((ca hoi) or (xa hoi)). hieu vien cach tu van hanh hai cua triet*.