Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien dang » thien bang, thien danh, thien nang
dung tren » dung trong, dung trung
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
dinh ve » dinh ket, dinh van
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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 thien dang xa hoi. hieu van cam tuc va dinh ve ((dung tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien dang xa hoi. hieu van cam tuc va dinh ve ((dung tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach thien dang xa hoi. hieu van cam tuc va dinh ve ((dung tren) or (cuu tre))*.