Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac tru » ca tru, cac tro, cac thu
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
tru va » truc va, tu va, trung va
vi cuu » vi luu, vinh cuu

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: ((su sach) OR (so sach)) y nang xa hoi. ((hieu van) OR (hieu va)) cac tru va danh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang xa hoi. ((hieu van) OR (hieu va)) cac tru va danh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. ((hieu van) OR (hieu va)) cac tru va danh vi cuu tre*.