Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
thien danh » thien anh, thien dang, thien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
thu dung » thuy dung, thuc dung, thu dong
thu dang » thu hang, thu bang, thu dong
cong dan » cong san, cong tan, huong dan
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 ((hieu manh) or (thien danh)) - thanh trong ((thu dung) OR (thu dang)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien danh)) - thanh trong ((thu dung) OR (thu dang)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (thien danh)) - thanh trong ((thu dung) OR (thu dang)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien danh)) - thanh trong ((thu dung) OR (thu dang)) cong dan toan cau*.