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

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: te ((sach ky) OR (sach ty)) nang ((ma hoi) OR (ma hoa)). hieu ve cam duc va doanh dan cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang ((ma hoi) or (ma hoa)). hieu ve cam duc va doanh dan cua te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang ((ma hoi) or (ma hoa)). hieu ve cam duc va doanh dan cua te*.