Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, tien anh, thien chanh
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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 ((thien anh) OR (thien thanh)) - ((thanh trung) or (thanh tung)) va nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (thien thanh)) - ((thanh trung) OR (thanh tung)) va nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) OR (thien thanh)) - ((thanh trung) or (thanh tung)) va nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) OR (thien thanh)) - ((thanh trung) or (thanh tung)) va nhung cong dan toan cao*.