Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va doanh » van doanh, vay doanh, va danh
tai cua » thai cua, tai cuc, tri cua
cac dai » cac dan, cac bai, can dai
hieu va » lieu va
ky danh » ky anh
ky dang » ky nang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
dai va » mai va

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

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