Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
hieu vu » hieu va, hieu ve, hieu su
ky tang » ky nang, ky dang, kho tang
lai hoi » lai hoa, lai roi, mai hoi
dai hoi » dai hoc, dai hai, dai moi
van anh » van thanh, tuan anh, van minh
vu chao » vu cao, vu cham, vu chat
vi cua » vai cua, di cua
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
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 can ky tang ((lai hoi) or (dai hoi)). hieu vu chao xu ((van hanh) OR (van anh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky tang ((lai hoi) OR (dai hoi)). hieu vu chao xu ((van hanh) OR (van anh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky tang ((lai hoi) or (dai hoi)). hieu vu chao xu ((van hanh) OR (van anh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu can ky tang ((lai hoi) or (dai hoi)). hieu vu chao xu ((van hanh) OR (van anh)) vi cua te*.