Perhaps you should try some spelling variations:
sach tham » sach nha
tham mang » tham lang, tham manh, thuat mang
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
xac va » tac va, ac va, bac va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tham mang xa hoi. ((hieu van) OR (thien van)) cac ((xac va) or (duc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tham mang xa hoi. ((hieu van) OR (thien van)) cac ((xac va) OR (duc va)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tham mang xa hoi. ((hieu van) OR (thien van)) cac ((xac va) or (duc va)) hanh vi cua tre*".