Perhaps you should try some spelling variations:
hanh dinh » thanh dinh, hinh dinh, anh dinh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
cao duc » dao duc, cao suc, tao duoc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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 ky lang xa hoi. hieu van ((cao duc) or (giao duc)) va ((hanh dinh) OR (hanh tinh)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu van ((cao duc) OR (giao duc)) va ((hanh dinh) OR (hanh tinh)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu van ((cao duc) or (giao duc)) va ((hanh dinh) OR (hanh tinh)) cuu tre*".