Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh bay » trinh ban, trinh bao, trinh ky
trinh may » trinh ky, trinh han, trinh ly
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
ho chau » ha chau, ho chu, o chau
a chau » ha chau, lai chau, hat chau

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 chau) OR (a chau)) tinh - hanh ((trinh bay) OR (trinh may)) nhung cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chau) or (a chau)) tinh - hanh ((trinh bay) OR (trinh may)) nhung cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chau) or (a chau)) tinh - hanh ((trinh bay) OR (trinh may)) nhung cong dan toan cau*.