Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
truong va » truong dai, truong cao, truong dao
va thong » va thuong, va phuong, he thong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » 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 ((chiet tach) or (hieu lang)) - thanh truong va thong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (hieu lang)) - thanh truong va thong cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (hieu lang)) - thanh truong va thong cong san toan cau*.