Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh doi » thanh doi, hanh noi, hang doi
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
ly nang » ky nang, ly hang, ly vang
va nam » van nam, ha nam, va nay
cua te » cua tu
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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