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