Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
vien da » vien dai, hien dai
cua tre » cua te, cua triet, dua tren
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va cam » va cham, va cac, va cao
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: thu sach ky tang xa hoi. hieu ((va cam) or (vien da)) tuc va hanh vi ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang xa hoi. hieu ((va cam) OR (vien da)) tuc va hanh vi ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang xa hoi. hieu ((va cam) or (vien da)) tuc va hanh vi ((cuu tre) OR (cua tre))*".