Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
cuu tre » cau tren, cau treo
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tuoc va » thuoc va, nuoc va, duoc va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cua triet, dua tren

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 xa hoi. ((hieu vien) or (hieu viec)) bach tuoc va hanh di ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu vien) OR (hieu viec)) bach tuoc va hanh di ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu vien) or (hieu viec)) bach tuoc va hanh di ((cuu tre) OR (cua tre))*".