Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
long ha » dong ha, cong ha, dong hoa
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
va cam » va cham, va cac, va cao
cua te » cua tu

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 duc ban thanh doi ((cua tre) OR (cua te))~.
• 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 duc ban thanh doi ((cua tre) OR (cua te)).
• 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 duc ban thanh doi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang x) or (long ha)) hoi. hieu va cam duc ban thanh doi ((cua tre) OR (cua te))*.