Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
qua ban » qua quan
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: su sach ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((cua ban) or (qua ban)) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((cua ban) OR (qua ban)) thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((cua ban) or (qua ban)) thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((cua ban) or (qua ban)) thanh hai cua tre*.