Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien bang » khien bang, thien ban, thien dang
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
va tinh » may tinh
cuu tre » cua tre, cau treo
su sach » so sach, vu sach
bang xa » lang xa, bang va, mang xa
hieu va » lieu va, hieu qua
tinh vi » trinh vi, tinh voi, tinh va
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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 bang xa hoi. hieu va cam xuc va tinh vi ((dua tren) or (((cuu tre) OR (cau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien bang xa hoi. hieu va cam xuc va tinh vi ((dua tren) OR (((cuu tre) OR (cau tren))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thien bang xa hoi. hieu va cam xuc va tinh vi ((dua tren) or (((cuu tre) OR (cau tren))))*".