Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
danh di » danh du, xanh di, danh dien
dinh vi » dinh ve, dinh viet, dinh tri
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet

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 ty hang xa hoi. ((hieu va) or (hieu qua)) cam duc va ((dinh vi) or (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang xa hoi. ((hieu va) OR (hieu qua)) cam duc va ((dinh vi) OR (danh di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty hang xa hoi. ((hieu va) or (hieu qua)) cam duc va ((dinh vi) or (danh di)) cua tre*.