Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » chiet tach, thuat tach
thien hach » thien thanh, hien hanh
thuong lan » thuong han, phuong lan, thuong mai
thong qua » thong quan, thong cua, thong tu
trung va » truong va, trang va, trung ha
than cau » toan cau, phan cau, than cap

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