Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
long ha » dong ha, cong ha, dong hoa
hieu va » lieu va, hieu qua
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
doi cua » dai cua, hoi cua, dong cua
cua tre » cua te, cuu tre, cua triet
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 ty ((nang x) or (long ha)) hoi. hieu va cam ((xuc ban) OR (duc ban)) thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang x) OR (long ha)) hoi. hieu va cam ((xuc ban) OR (duc ban)) thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang x) or (long ha)) hoi. hieu va cam ((xuc ban) OR (duc ban)) thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang x) or (long ha)) hoi. hieu va cam ((xuc ban) OR (duc ban)) thanh doi cua tre*.