Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
nang xa » lang xa, nang ma, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (nang x)) hoi. ((hieu va) OR (hieu qua)) cam duc ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. ((hieu va) OR (hieu qua)) cam duc ban thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. ((hieu va) OR (hieu qua)) cam duc ban thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. ((hieu va) OR (hieu qua)) cam duc ban thanh hai cua tre*.