Perhaps you should try some spelling variations:
chiet tach » chieu sach
duong sinh » duong minh, duong manh, trong sinh
manh tung » manh hung, thanh tung
chua nang » chuc nang, chua xang, kha nang
sinh toan » tinh toan, hinh toan, minh toan
ho chiet » ho chieu, ho thiet, hoc thiet
toan cau » toan cao, toan ban, toan tap

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: ho chiet tach - manh tung ((chua nang) OR ((chuc OR thuc) nang)) duong sinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - manh tung ((chua nang) or ((chuc OR thuc) nang)) duong sinh toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - manh tung ((chua nang) or ((chuc OR thuc) nang)) duong sinh toan cau*.