Perhaps you should try some spelling variations:
vay khanh » van khanh, vay khach, van khang
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
thanh vi » hanh vi, thanh va, thanh ve
su triet » su tien, ve triet
khanh y » khanh ly, hanh y, khanh v
cua tre » cua te, cuu tre, cua triet
su viet » so viet
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: vay khanh y nang x hoi. hieu van nam thuc ban thanh vi ((cua tre) or (((su triet) OR (su viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vay khanh y nang x hoi. hieu van nam thuc ban thanh vi ((cua tre) OR (((su triet) OR (su viet))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vay khanh y nang x hoi. hieu van nam thuc ban thanh vi ((cua tre) or (((su triet) OR (su viet))))*".