Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
cao xuc » cam xuc, cao duc, cao suc
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
hoa doi » hoa dai, hoc doi, xoa doi
ky dang » ky nang, ky danh
va dan » ca dan, va dao, va dau
vi cuu » vi luu, vinh cuu
va cao » va cac, va co, va dao

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 ((hoa doi) or (hoa hoc)). hieu va cao xuc ((ban hanh) or (va dan)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky dang ((hoa doi) OR (hoa hoc)). hieu va cao xuc ((ban hanh) OR (va dan)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky dang ((hoa doi) or (hoa hoc)). hieu va cao xuc ((ban hanh) or (va dan)) vi cuu tre*.