Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
van cua » vang cua, ban cua, dan cua
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
nang xa » nang x, 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 (lang xa)) hoi. ((hieu va) or (hieu qua)) cac duc ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang xa)) hoi. ((hieu va) OR (hieu qua)) cac duc ban thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (lang xa)) hoi. ((hieu va) or (hieu qua)) cac duc ban thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) OR (lang xa)) hoi. ((hieu va) or (hieu qua)) cac duc ban thanh van cua tre*.