Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
thanh tung » thanh cong
hien manh » hien hanh, tien manh, hien nhanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
tung cap » trung cap, cung cap, thong cap
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 ((hien manh) OR (hieu manh)) - thanh tung cap ((thong duong) or (hang thuong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (hieu manh)) - thanh tung cap ((thong duong) OR (hang thuong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (hieu manh)) - thanh tung cap ((thong duong) or (hang thuong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (hieu manh)) - thanh tung cap ((thong duong) or (hang thuong)) dan toan cao*.