Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc
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 hoc)). hieu va am thuc vat hanh doi 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 hoc)). hieu va am thuc vat hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) y nang ((x hoi) OR (o hoc)). hieu va am thuc vat hanh doi cua tre*.