Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
dang mam » dang nam, dang mau, dang mat
cam duc » cam xuc, cao duc, pham duc
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
mam hoi » mam hoai, nam hoi, mai hoi
ky dang » ky nang, ky danh
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) or (toc sach)) ky dang mam hoi. ((hieu ve) or (lieu va)) cam duc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang mam hoi. ((hieu ve) OR (lieu va)) cam duc ban thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang mam hoi. ((hieu ve) or (lieu va)) cam duc ban thanh tai cua tre*.