Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cau tren » cu tren, dau tren, ca tren
mai khoi » mai khoa, tai khoa, cac khoi
van cau » van dau, van hau, van chat
thu sac » thu sach, thu san, thu xac
mai hoi » dai hoi, lai hoi, mai doi
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky sang ((mai hoi) or (mai khoi)). hieu ve cam ((xuc va) OR (luc va)) doanh van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky sang ((mai hoi) OR (mai khoi)). hieu ve cam ((xuc va) OR (luc va)) doanh van cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky sang ((mai hoi) or (mai khoi)). hieu ve cam ((xuc va) OR (luc va)) doanh van cau tren*".