Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai
va am » va lam, va cam
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) OR (o hoi)). hieu va am thuc vat hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y nang ((x hoi) OR (o hoi)). hieu va am thuc vat hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) y nang ((x hoi) OR (o hoi)). hieu va am thuc vat hanh di cua tre*.