Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
toc van » hoc van, toc san, tac van
van anh » van thanh, tuan anh, van minh
su tien » su hien, tu tieng, dau tien
anh ve » hanh ve, anh va, anh viet
x hoi » xa hoi, o hoi, x ho
kien » bien, dien, hien

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 nang x hoi. hieu vien cac toc van anh ve ((su tien) OR (su kien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu vien cac toc van anh ve ((su tien) OR (su kien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu vien cac toc van anh ve ((su tien) OR (su kien))*.