Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, dieu hanh
thong dan » thong van, tuong dan, thong den
hoc hieu » hoc thieu, hoc hien, doc hieu
va thong » va thuong, va phuong, va cong
dan than » dan chan, ban than, van than
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 hieu manh - ((thanh trung) or (canh tranh)) ((va thong) OR (he thong)) thong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((thanh trung) OR (canh tranh)) ((va thong) OR (he thong)) thong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((thanh trung) or (canh tranh)) ((va thong) OR (he thong)) thong dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((thanh trung) or (canh tranh)) ((va thong) OR (he thong)) thong dan than cau*.