Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ky tang » ky nang, ky dang, kho tang
lai hoi » dai hoi, lai hoa, mai hoi
lai roi » loi roi
hieu vu » hieu va, hieu ve, hieu su
vu chao » vu cao, vu cham, vu chat
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
xu van » tu van, vu van, su van
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky tang ((lai hoi) or (lai roi)). hieu vu chao xu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky tang ((lai hoi) OR (lai roi)). hieu vu chao xu van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu dan ky tang ((lai hoi) or (lai roi)). hieu vu chao xu van hanh vi cua te*.