Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hanh trinh » canh tranh, hanh chinh
nha hieu » nha dieu, nghe hieu, phan hieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
luat » luan, xuat

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

• Performing a fuzzy search may retrieve terms with similar spellings: nha hieu tieng - hanh trinh luat thuong ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nha hieu tieng - hanh trinh luat thuong ((cong dan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: nha hieu tieng - hanh trinh luat thuong ((cong dan) or (cong san)) toan cau*.