Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh toan » thanh hoa, thanh san, tinh toan
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
tranh va » tranh van, trang va, trinh va
toan cao » toan ban, toan tap
hieu va » lieu va, hieu qua

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: ho ((hieu va) OR (hieu quang)) - canh tranh va ((hang cong) OR (hang nong)) thanh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu va) or (hieu quang)) - canh tranh va ((hang cong) OR (hang nong)) thanh toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu va) or (hieu quang)) - canh tranh va ((hang cong) OR (hang nong)) thanh toan cao*.