Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
phung manh » hung manh, phung minh, phung thanh
nhung manh » hung manh, nhung thanh, nhung van
hieu sang » chieu sang, hieu lang, hieu quang
doanh cua » doanh luan
cua nhung » va nhung
toan tap » toan ban

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: doc ((hieu sang) OR (thieu quang)) - kinh doanh cua nhung ((phung manh) OR (nhung manh)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (thieu quang)) - kinh doanh cua nhung ((phung manh) OR (nhung manh)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (thieu quang)) - kinh doanh cua nhung ((phung manh) OR (nhung manh)) toan tap*.