Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tung tam » trung tam, vung tam, tuong tac
dung tam » duong tam, dung tai, dung lam
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - thanh ((tung tam) OR (dung tam)) dung cong thanh toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh ((tung tam) OR (dung tam)) dung cong thanh toan ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((tung tam) OR (dung tam)) dung cong thanh toan ban*.