Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tang van » dang van, hoang van, trong van
hanh vai » hanh vi, hanh va, hanh tai
hau thuc » huu thuc, mau thuc, khau thuoc
hieu van » hieu va, thien van, lieu va
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
so sach » so sanh, bo sach, co sach
ha thuc » va thuc, ha thuy, ha thu
va hanh » van hanh, va thanh, va danh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

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) or (so sach)) ky tang van hoi. hieu van ((hau thuc) OR (ha thuc)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (so sach)) ky tang van hoi. hieu van ((hau thuc) OR (ha thuc)) va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (so sach)) ky tang van hoi. hieu van ((hau thuc) OR (ha thuc)) va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (so sach)) ky tang van hoi. hieu van ((hau thuc) OR (ha thuc)) va hanh vai cuu tre*.