Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
nam duoc » nam thuoc, da duoc, dat duoc
duoc gia » duoc giao, quoc gia, duc gia
thanh va » thanh van, hanh va, thanh ha
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
cua tre » cua te, cuu tre, cua triet
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. ((hieu van) OR (thien van)) nam duoc gia thanh va ((cua tre) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. ((hieu van) OR (thien van)) nam duoc gia thanh va ((cua tre) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. ((hieu van) OR (thien van)) nam duoc gia thanh va ((cua tre) or (cua tu))*.