Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
tinh cua » trinh cua, sinh cua, tranh cua
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

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