Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
duong cong » dung cong, luong cong, duong trong
cao dieu » cau dieu, cac dieu, cap dieu
tuong va » truong va, thuong va, luong va
va duong » van duong, va tuong, va huong
cong san » cong tac
toan tai » toan tap, doanh tai, toan ban
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: ((cao dieu) OR (cao hieu)) tinh - thanh tuong va duong cong san ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cao dieu) OR (cao hieu)) tinh - thanh tuong va duong cong san ((toan tai) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cao dieu) OR (cao hieu)) tinh - thanh tuong va duong cong san ((toan tai) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ((cao dieu) OR (cao hieu)) tinh - thanh tuong va duong cong san ((toan tai) or (toan cao))*.