Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
dua tren » dung tren
su sach » so sach
vu sach » vu bach, vu khach
hieu le » hieu ve, hieu he, hieu ly
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
le am » le ham, le nam, le a
thuc » thu

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 am thuc vat hanh di ((dua tren) 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 am thuc vat hanh di ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang x hoi. hieu le am thuc vat hanh di ((dua tren) or (cuu tre))*.