Perhaps you should try some spelling variations:
dan doanh » van doanh, san doanh, ban doanh
cham thuc » nham thuc, pham thuc, tham thuc
vu khach » vu khanh, vu khac, vay khach
thuc dan » thuc hanh, hoc dan, thuc vat
vu sach » vu bach, su sach
tai cua » thai cua, tai cuc, tri cua
va cham » va chat, va tham
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
xang xa » lang xa, ang xa, dang xay
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: ((vu sach) or (vu khach)) ty ((xang xa) OR (mang xa)) hoi. hieu va cham thuc dan doanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ty ((xang xa) OR (mang xa)) hoi. hieu va cham thuc dan doanh tai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ty ((xang xa) OR (mang xa)) hoi. hieu va cham thuc dan doanh tai cua te*".