Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
sach nuoc » sach duoc, cac nuoc, bach tuoc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
de cuu » de cua

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 lang xa hoi. ((hieu vien) OR (hieu viec)) sach nuoc ((va hanh) or (va danh)) de cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu vien) OR (hieu viec)) sach nuoc ((va hanh) OR (va danh)) de cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu vien) OR (hieu viec)) sach nuoc ((va hanh) or (va danh)) de cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu vien) OR (hieu viec)) sach nuoc ((va hanh) or (va danh)) de cuu tre*.