Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
hieu lang » chieu sang, hieu quang, nhieu tang
cua nong » cua cong, cuu nong, cua dong
cong tac » cong ty
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho 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 lang - ((hanh trang) or (hanh trinh)) cua nong ((cong san) OR (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh trang) OR (hanh trinh)) cua nong ((cong san) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh trang) or (hanh trinh)) cua nong ((cong san) OR (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh trang) or (hanh trinh)) cua nong ((cong san) OR (cong tac)) toan cao*.