Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
nang dau » hang dau, xang dau, nang du
cham duc » pham duc, cham soc, pham duy
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cua triet, dua tren
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
dau hoi » cau hoi, dai hoi, dan hoi
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) nang dau hoi. hieu ve cham duc van doanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang dau hoi. hieu ve cham duc van doanh tai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang dau hoi. hieu ve cham duc van doanh tai ((cua tre) or (cuu tre))*.