Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, nhung don
nganh toan » nganh thanh, thanh toan, manh toan
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, trinh va
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((nhiet dong) or (hieu quang)) - canh tranh va ((nhung cong) OR (hang cong)) nganh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((nhiet dong) OR (hieu quang)) - canh tranh va ((nhung cong) OR (hang cong)) nganh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhiet dong) or (hieu quang)) - canh tranh va ((nhung cong) OR (hang cong)) nganh toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((nhiet dong) or (hieu quang)) - canh tranh va ((nhung cong) OR (hang cong)) nganh toan cao*.