Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
sach nuoc » sach duoc, bach tuoc, dich nuoc
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu thien ((sach nuoc) OR (cac nuoc)) va danh vi cua cu~".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu thien ((sach nuoc) OR (cac nuoc)) va danh vi cua cu*.