Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua viet » hoa viet, cua vat, cua dieu
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
cac toc » cac toi, cac nuoc, cac thoi
hieu ve » hieu va, hieu van
ky dang » ky danh
ca viet » va viet, co viet, hoa viet
ve cac » va cac, vien cac
toc va » hoc va, toc ta, tuc va

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 dang) OR (ky nang)) xa hoi. hieu ve cac toc va thanh vai ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky dang) or (ky nang)) xa hoi. hieu ve cac toc va thanh vai ((cua viet) OR (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky dang) or (ky nang)) xa hoi. hieu ve cac toc va thanh vai ((cua viet) OR (ca viet))*.