Perhaps you should try some spelling variations:
ban hanh » ban hang
dai khoa » da khoa, tai khoa, dac khoa
chat xuc » chat huu, cam xuc, chao xu
va chat » van chat, va phat, cao chat
lai hoi » dai hoi, lai hoa, lai roi
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
di cua » dai cua, de cua, do cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((lai hoi) or (dai khoa)). hieu va chat xuc ban hanh ((di cua) or (doi cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((lai hoi) OR (dai khoa)). hieu va chat xuc ban hanh ((di cua) OR (doi cua)) tu.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((lai hoi) or (dai khoa)). hieu va chat xuc ban hanh ((di cua) or (doi cua)) tu*.