Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, ve cac, va cam
ma hoi » xa hoi, me hoi, va hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((((ma hoi) OR (ma hoa))) or (mai hoi)). hieu ve cam duc va doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((ma hoi) OR (ma hoa))) OR (mai hoi)). hieu ve cam duc va doanh van cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((((ma hoi) OR (ma hoa))) or (mai hoi)). hieu ve cam duc va doanh van cua te*".