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
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cua » vang cua, ban cua, dan cua
ma hoi » mai hoi, xa hoi, ma hoa
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((ve cai) OR (ve cac)) duc va doanh van cua te~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((ve cai) or (ve cac)) duc va doanh van cua te*.