Perhaps you should try some spelling variations:
thanh anh » thanh binh, thanh san, hinh anh
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
cac thoi » cac toi, cac hop, cac tro
su sach » so sach, vu sach
ky dang » ky nang
ky danh » ky anh
cac toc » cac toi, cac nuoc
anh va » hanh va
va va » va van, va vua, va vai

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: su sach ((ky danh) OR (ky dang)) xa hoi. hieu vien ((cac toc) OR (cac thoi)) thanh anh va va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky danh) OR (ky dang)) xa hoi. hieu vien ((cac toc) or (cac thoi)) thanh anh va va triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky danh) OR (ky dang)) xa hoi. hieu vien ((cac toc) or (cac thoi)) thanh anh va va triet*.