Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
bach ky » bac ky
nam tuc » nam thuc, nam truc, nam tu
tuc ban » thuc ban, truc ban, tu ban
cua tre » cua te, cuu tre, cua triet
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 bach ky nang x hoi. hieu van nam tuc ban thanh lap ((cua tre) or (((cua viet) or (va triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang x hoi. hieu van nam tuc ban thanh lap ((cua tre) OR (((cua viet) OR (va triet)))).
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang x hoi. hieu van nam tuc ban thanh lap ((cua tre) or (((cua viet) or (va triet))))*.