Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
truong va » truong dai, truong cao, truong dao
lang cong » dang cong, bang cong, hang cong
cong danh » cuong danh, cong dan, cong thanh
danh toan » manh toan, anh toan, dan toan
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: doi ((hieu lang) OR (hieu quang)) - thanh ((trung tam) or (truong va)) lang cong danh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (hieu quang)) - thanh ((trung tam) OR (truong va)) lang cong danh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (hieu quang)) - thanh ((trung tam) or (truong va)) lang cong danh toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (hieu quang)) - thanh ((trung tam) or (truong va)) lang cong danh toan cao*.