Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cau treo » cau theo, cau tren, cau triet
thanh di » thanh doi, thanh de, thanh do
nam thuc » nam thuoc, am thuc, nam thu
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
hieu le » hieu ve, hieu he, hieu ly
y nang » ky nang, ly nang, v nang
le nam » ly nam, he nam, le na
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: ((su sach) or (vu bach)) y nang x hoi. hieu le nam thuc vat thanh di ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) y nang x hoi. hieu le nam thuc vat thanh di ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) y nang x hoi. hieu le nam thuc vat thanh di ((cua tre) or (cau treo))*.