Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
van thuat » va thuat, van thuan, van tuan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
x hoi » o hoi, x ho, 5 hoi

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

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