Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thuc ban » thuoc ban, thuc dan, thu ban
thanh vi » hanh vi, thanh va, thanh ve
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, v nang, may nang
van am » van nam, van lam, van dam
x hoi » xa hoi, o hoi, x ho
khach » khac, khanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vay khach ((y nang) OR (ly nang)) x hoi. hieu van am thuc ban thanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vay khach ((y nang) OR (ly nang)) x hoi. hieu van am thuc ban thanh vi ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vay khach ((y nang) OR (ly nang)) x hoi. hieu van am thuc ban thanh vi ((cua tre) or (cua triet))*".