Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
dung cong » dung trong
cong dang » cong dong, cong dan, cong dung
trang cho » trong cho, trang o, sang cho
tranh va » tranh van, trang va, trinh va
tran cao » toan cao, tran chau, tranh cac
va dung » van dung, va duong, vat dung

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 dung cong dang ((tran cao) OR (trang cho))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((nhiet dong) OR (hieu quang)) - canh tranh va dung cong dang ((tran cao) OR (trang cho)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhiet dong) or (hieu quang)) - canh tranh va dung cong dang ((tran cao) OR (trang cho))".
• Adding a wildcard symbol may retrieve word variants: ho ((nhiet dong) or (hieu quang)) - canh tranh va dung cong dang ((tran cao) OR (trang cho))*.