Perhaps you should try some spelling variations:
trang thieu » trang thiet, trang tieu, thanh thieu
tinh trang » minh trang, tinh quang, tinh toan
thieu dang » thien dang, thieu khang, thieu quang
dang cong » dung cong
doc hieu » hoc thieu, hoc hien
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: ((doc hieu) or (toc thieu)) sang - tinh trang thieu dang cong tan dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sang - tinh trang thieu dang cong tan dan ca*.