Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thanh va » thanh van, hanh va, thanh ha
thuc day » thuc dan, thuc vat
vu khach » vu khanh, vu khac, vay khach
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
y nang » ky nang, ly nang, v nang
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 x hoi. hieu ve nam thuc day ((thanh va) or (hanh vi)) ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach y nang x hoi. hieu ve nam thuc day ((thanh va) OR (hanh vi)) ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: vu khach y nang x hoi. hieu ve nam thuc day ((thanh va) or (hanh vi)) ((cua tre) or (su triet))*.