Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, nhieu tang, hieu van
chinh cua » chinh ca, chinh sua, hinh cua
dung cong » dung trong
danh tuan » anh tuan, manh tuan, danh thanh
tuan cau » toan cau, quan cau, tuan cu

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 lang) or (hieu quang)) - hanh chinh cua ((nhung cong) OR (dung cong)) danh tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - hanh chinh cua ((nhung cong) OR (dung cong)) danh tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - hanh chinh cua ((nhung cong) OR (dung cong)) danh tuan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - hanh chinh cua ((nhung cong) OR (dung cong)) danh tuan cau*.