Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien danh » thien anh, thien dang, thien thanh
hien danh » hien hanh, hien nhanh, hien khanh
chua xang » chua nang, chu bang, chua dong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
toan cau » toan cao, toan ban, toan tap
chuc » thuc, chu, phuc

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien danh) OR (thien danh)) - thanh trung ((chua xang) OR (chuc nang)) cong manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien danh) OR (thien danh)) - thanh trung ((chua xang) or (chuc nang)) cong manh toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien danh) OR (thien danh)) - thanh trung ((chua xang) or (chuc nang)) cong manh toan cau*.