Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
thu sach » tu sach, thuat sach, thuoc sach
va doanh » vay doanh, va danh, hoa doanh
nang ma » tang ma, sang ma, mang may
van cua » vang cua, ban cua, dan cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
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: thu sach ky ((nang ma) OR (nang cao)) hoi. hieu ve cac tuc ((va doanh) or (van doanh)) van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (nang cao)) hoi. hieu ve cac tuc ((va doanh) OR (van doanh)) van cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) OR (nang cao)) hoi. hieu ve cac tuc ((va doanh) or (van doanh)) van cua te*".