Perhaps you should try some spelling variations:
trung thanh » truong thanh
trung tuan » trung tam, tran tuan, truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
cong san » cong tac
san chan » san chang, dan chan, san chay
chan cau » phan cau, can cau, chinh cau

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 (cuu tinh)) - thanh ((trung tuan) OR (trung thanh)) dang cong san chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (cuu tinh)) - thanh ((trung tuan) OR (trung thanh)) dang cong san chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (cuu tinh)) - thanh ((trung tuan) OR (trung thanh)) dang cong san chan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (cuu tinh)) - thanh ((trung tuan) OR (trung thanh)) dang cong san chan cau*.