Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu qua, diep quang
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cua trong » cua truong, cua trung, qua trong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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: ho ((((hieu quang) OR (hieu quan))) or (nhieu tang)) - thanh trung cua trong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((hieu quang) OR (hieu quan))) OR (nhieu tang)) - thanh trung cua trong cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((((hieu quang) OR (hieu quan))) or (nhieu tang)) - thanh trung cua trong cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((((hieu quang) OR (hieu quan))) or (nhieu tang)) - thanh trung cua trong cong dan toan cao*.