Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chiet tach) or (hieu qua)) - thanh trung tuan ((nhung cong) OR (thong cong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu qua)) - thanh trung tuan ((nhung cong) OR (thong cong)) tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu qua)) - thanh trung tuan ((nhung cong) OR (thong cong)) tan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu qua)) - thanh trung tuan ((nhung cong) OR (thong cong)) tan toan cau*.