Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tuan » trung thanh, trung tam, tran tuan
soc thiet » hoc thiet, so thiet, hoc thieu
tuan dung » tuan duong, tran dung, tan dung
thanh lap » thanh san, phan lap, thanh hai
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh

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

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