Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
cac giao » cach giao, cac giai, ca giao
dinh vai » dinh van, dinh vi, dinh va
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
cac lao » ca lao, cac loai, cac lang
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang x hoi. hieu vien ((cac lao) OR (cac giao)) va dinh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang x hoi. hieu vien ((cac lao) OR (cac giao)) va dinh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang x hoi. hieu vien ((cac lao) OR (cac giao)) va dinh vai cua triet*.