Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

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

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