Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
kho tang » cao tang
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
vien da » vien dai, hien dai
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, ky trong
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
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: thu sach ((ky tang) OR (kho tang)) xa hoi. hieu ((va cam) or (vien da)) tuc va dinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky tang) OR (kho tang)) xa hoi. hieu ((va cam) OR (vien da)) tuc va dinh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky tang) OR (kho tang)) xa hoi. hieu ((va cam) or (vien da)) tuc va dinh vi cua tre*".