Perhaps you should try some spelling variations:
duong trong » dung trong
thieu xanh » chieu xanh, thien anh, thien danh
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua duong » cua dong, cua huong, qua duong
trong tan » trong quan, trong cac, trong ca
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (hieu manh)) - ((thanh trung) OR (thanh tung)) cua duong trong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - ((thanh trung) OR (thanh tung)) cua duong trong tan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - ((thanh trung) OR (thanh tung)) cua duong trong tan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - ((thanh trung) OR (thanh tung)) cua duong trong tan toan tap*.