Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
trinh quan » trinh luat, trinh han
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
toan cao » toan ban
toan tap » toan 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 - hanh ((trinh quan) or (tinh quang)) hang cong dan ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh ((trinh quan) OR (tinh quang)) hang cong dan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - hanh ((trinh quan) or (tinh quang)) hang cong dan ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh ((trinh quan) or (tinh quang)) hang cong dan ((toan cao) OR (toan tap))*.