Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
ban hanh » ban hang
chat xuc » chat huu, cam xuc, chao xu
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
ky dang » ky nang, ky danh
mai hoi » dai hoi, lai hoi, mai doi
vai cua » dai cua, hai cua, lai cua
va chat » van chat, va phat, cao chat
vi cua » di 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 dang ((mai hoi) OR (mai khoi)). hieu va chat xuc ban hanh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang ((mai hoi) OR (mai khoi)). hieu va chat xuc ban hanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang ((mai hoi) OR (mai khoi)). hieu va chat xuc ban hanh ((vi cua) or (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang ((mai hoi) OR (mai khoi)). hieu va chat xuc ban hanh ((vi cua) or (vai cua)) te*.