Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
te sach » toc sach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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

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