Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh xuan » trinh quan, trinh luan, trinh luat
xuan thong » xuat thong, xuan thang, xuan truong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: doc hieu xanh - hanh trinh xuan thong ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh trinh xuan thong ((cong dan) OR (cong san)) toan cau*.