Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
so sach » so sanh, bo sach, co sach
nam duc » nam duoc, nam thuc, nam buoc
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (thuoc sach)) ky nang x hoi. hieu van ((nam duc) or (pham duc)) ban thanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thuoc sach)) ky nang x hoi. hieu van ((nam duc) OR (pham duc)) ban thanh va cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thuoc sach)) ky nang x hoi. hieu van ((nam duc) or (pham duc)) ban thanh va cuu tre*.