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