Perhaps you should try some spelling variations:
ban hanh » ban hang
qua chat » qua nhat, qua cham, luan chat
chat xuc » chat huu, cam xuc, chao xu
xuc ban » duc ban, cuc ban, quoc ban
ky dang » ky nang, ky danh
mai hoi » mai khoi, dai hoi, lai hoi
dai moi » doi moi, dai hoi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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 dang ((mai hoi) or (dai moi)). hieu qua chat xuc ban hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang ((mai hoi) OR (dai moi)). hieu qua chat xuc ban hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang ((mai hoi) or (dai moi)). hieu qua chat xuc ban hanh vi ((cua te) or (cua tu))*.