Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
thanh tung » thanh cong
canh nhung » anh nhung, hanh nhung, doanh nhung
hieu manh » chieu xanh, hieu nganh, dieu hanh
vap nhung » va nhung, ve nhung, voi nhung
tung dan » dung dan, huong dan, trung dai
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 ((thieu xanh) OR (hieu manh)) - thanh tung ((canh nhung) or (vap nhung)) tung dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh tung ((canh nhung) OR (vap nhung)) tung dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - thanh tung ((canh nhung) or (vap nhung)) tung dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - thanh tung ((canh nhung) or (vap nhung)) tung dan toan cau*.