Perhaps you should try some spelling variations:
trang thiet » trong thiet, trinh thiet, toan thiet
tinh trang » minh trang, tinh quang, tinh toan
thiet dang » thien dang, nhiet dong, nhiet nang
doi chieu » doc hieu, doi chi, mot chieu
dang cong » dung cong
cong tan » cong tac, cong san, cong thanh
tan dan » tang dan, tan doan, ban dan

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) or (toc thieu)) sang - tinh trang thiet dang cong tan dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sang - tinh trang thiet dang cong tan dan ca*.