Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
cac duc » cac du, cao duc, cac dac
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ky danh » ky anh, ky dang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky danh ((mai hoi) or (xa hoi)). ((hieu ve) or (hieu va)) cac duc va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky danh ((mai hoi) OR (xa hoi)). ((hieu ve) OR (hieu va)) cac duc va thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky danh ((mai hoi) or (xa hoi)). ((hieu ve) or (hieu va)) cac duc va thanh tai cua tre*.