Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
thanh ve » hanh ve, thanh va, thanh vien
su triet » su viet, su tien, ve triet
cua tre » cua te, cuu tre, cua triet
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 van nam thuc dan thanh ve ((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 van nam thuc dan thanh ve ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: vu khach y nang x hoi. hieu van nam thuc dan thanh ve ((cua tre) or (su triet))*.