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, cac khoi, dai khoa
va doanh » van doanh, vay doanh, va danh
tai khoa » da khoa, noi khoa
mai hoi » dai hoi, lai hoi, mai doi
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
van cau » van dau, van hau, van chat
thu sac » thu sach, thu san, thu xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc 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) OR (tai khoa)))). hieu ve cam xuc 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) OR (tai khoa)))). hieu ve cam xuc 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) OR (tai khoa)))). hieu ve cam xuc va doanh van cau tren*".