Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
nam thuoc » nam thuc, nam thu, nha thuoc
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
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 thuoc ban thanh 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 van nam thuoc ban thanh vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: vu khach y nang x hoi. hieu van nam thuoc ban thanh vi ((cua tre) or (su triet))*.