Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tuan » trung thanh, trung tam, tran tuan
hoc thieu » toc thieu, hoc hien
tuan cong » thuan cong, luan cong, tran cong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cao » toan ban, toan tap
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (hoc thieu)) tinh - thanh trung tuan cong ((cong tan) OR (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (hoc thieu)) tinh - thanh trung tuan cong ((cong tan) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chi) or (hoc thieu)) tinh - thanh trung tuan cong ((cong tan) OR (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (hoc thieu)) tinh - thanh trung tuan cong ((cong tan) OR (cong tac)) toan cao*.