Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
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: hoc ((thiet tach) OR (chiet tach)) - thanh trung tuan ((hang cong) or (dang cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (chiet tach)) - thanh trung tuan ((hang cong) OR (dang cong)) manh toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (chiet tach)) - thanh trung tuan ((hang cong) or (dang cong)) manh toan cao*".