Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan nhung » qua nhung, cua nhung, luan chung
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
ho hieu » hoi hieu, nho hieu, co hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) OR (ho chieu)) quang - hanh trinh quan nhung ((cong tan) or (cong tac)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (ho chieu)) quang - hanh trinh quan nhung ((cong tan) OR (cong tac)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) OR (ho chieu)) quang - hanh trinh quan nhung ((cong tan) or (cong tac)) phan tu".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) OR (ho chieu)) quang - hanh trinh quan nhung ((cong tan) or (cong tac)) phan tu*.