Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nam thuc » nam thuoc, am thuc, nam thu
hanh dai » hanh tai, hanh dao, vanh dai
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (vu khach)) ky nang x ho. hieu va nam thuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (vu khach)) ky nang x ho. hieu va nam thuc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (vu khach)) ky nang x ho. hieu va nam thuc va hanh dai cua tre*.