Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
dung cong » dung trong
trung va » truong va, trang va, trung ha
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chieu sang)) - thanh trung va dung cong thanh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - thanh trung va dung cong thanh toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu sang)) - thanh trung va dung cong thanh toan cao*.