Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
sieu viet » su viet, dien viet, bien viet
bach tuoc » sach duoc, sach nuoc
so sach » so sanh, bo sach, hoc sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tuoc va » thuoc va, nuoc va, duoc va
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
co sach » bo sach, cuon sach, hoc sach
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (co sach)) ky nang xa hoi. ((hieu vien) or (sieu viet)) bach tuoc va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang xa hoi. ((hieu vien) OR (sieu viet)) bach tuoc va hanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ky nang xa hoi. ((hieu vien) or (sieu viet)) bach tuoc va hanh di cuu tre*".