Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thuc ban » thuoc ban, thuc dan, thuc van
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
thu ban » thu hang
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 ban) OR (thu 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 ((thuc ban) OR (thu ban)) thanh vi ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach y nang x hoi. hieu van nam ((thuc ban) OR (thu 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 ((thuc ban) OR (thu ban)) thanh vi ((cua tre) or (su triet))*.