Perhaps you should try some spelling variations:
thanh nhung » hanh nhung, tranh nhung, thanh chuong
thanh tran » thanh trang, thanh toan, thanh tra
thanh hung » thanh huong, thanh tung, thanh trung
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
dan toan » van toan, dan than, manh toan
toan cau » 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 ((hien xanh) or (hien hanh)) - thanh tran ((thanh nhung) OR (thanh hung)) huong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - thanh tran ((thanh nhung) OR (thanh hung)) huong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - thanh tran ((thanh nhung) OR (thanh hung)) huong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - thanh tran ((thanh nhung) OR (thanh hung)) huong dan toan cau*.