Perhaps you should try some spelling variations:
canh thuc » anh thuc, cach thuc, danh thuc
ban doanh » van doanh, san doanh, ban danh
hieu van » hieu va, thien van, lieu va
doanh vi » doanh va, doan vi, doanh vien
thuc ban » thuoc ban, thuc dan, thu ban
lang van » dang van, tang van, hoang van
van canh » van anh, van hanh, van manh
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
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: so sach y ((((lang xa) OR (lang van))) or (nang ma)) hoi. hieu van canh thuc ban doanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((((lang xa) OR (lang van))) OR (nang ma)) hoi. hieu van canh thuc ban doanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((((lang xa) OR (lang van))) or (nang ma)) hoi. hieu van canh thuc ban doanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach y ((((lang xa) OR (lang van))) or (nang ma)) hoi. hieu van canh thuc ban doanh vi cua te*.