Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien lang » thien bang, thien dang, thien nang
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
su sach » so sach, vu sach
nam xuc » cam xuc, nam thuc, nam duoc
lang xa » lang ha, dang xay, lang van
nam xua » nam cua, nam mua, nam qua

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 thien lang xa hoi. hieu van ((nam xuc) OR (nam xua)) va dinh vi ((dua tren) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thien lang xa hoi. hieu van ((nam xuc) OR (nam xua)) va dinh vi ((dua tren) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: su sach thien lang xa hoi. hieu van ((nam xuc) OR (nam xua)) va dinh vi ((dua tren) or (cau tren))*.