Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
duong cong » dung cong, luong cong, duong trong
doi chieu » doi chi, ho chieu, mot chieu
dong cong » dung cong, dang cong, cong cong
doc hieu » toc thieu, hoc thieu, hoc hien
dung cua » dung luan, dung cho
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: ((doc hieu) or (doi chieu)) tinh - thanh dung cua ((dong cong) OR (duong cong)) san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chieu)) tinh - thanh dung cua ((dong cong) OR (duong cong)) san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (doi chieu)) tinh - thanh dung cua ((dong cong) OR (duong cong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (doi chieu)) tinh - thanh dung cua ((dong cong) OR (duong cong)) san toan cau*.