Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc thieu » toc thieu, hoc hien
trung cao » truong cao, trung cap, trung co
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc hien
cao dong » cao dang, lao dong, cao cong
cong san » cong tac
san tran » tan tran, ban tran, dang tran

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 (hoc thieu)) tinh - thanh trung cao dong cong san tran duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) tinh - thanh trung cao dong cong san tran duc.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) tinh - thanh trung cao dong cong san tran duc*.