Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » chiet tach, thuat tach
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
san thanh » van thanh, son thanh, dan thanh
ban thanh » ban hanh, ban hang
trung va » truong va, trang va, trung ha

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 (thien hach)) - thanh trung va nhung cong ((san thanh) or (ban thanh)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thien hach)) - thanh trung va nhung cong ((san thanh) OR (ban thanh)) cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thien hach)) - thanh trung va nhung cong ((san thanh) or (ban thanh)) cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (thien hach)) - thanh trung va nhung cong ((san thanh) or (ban thanh)) cap*.