Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach
hieu ve » hieu va, hieu van
vu sach » vu bach, vu khach
ly nang » ky nang, ly hang, ly vang
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
cua te » cua tu
ve nam » he nam, va nam, le nam
o hoi » co hoi, o hoc, o hai

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)) ly nang ((x ho) or (o hoi)). hieu ve nam thuc vat hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly nang ((x ho) OR (o hoi)). hieu ve nam thuc vat hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly nang ((x ho) or (o hoi)). hieu ve nam thuc vat hanh di cua te*.