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
hoc hieu » hoc thieu, hoc hien, doc hieu
cua hang » cua nhung, cua cong, cua ban
cua dang » cua cong, cua ban
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan ban » can ban, chat ban, chan nan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - ((hanh trang) OR (hanh trinh)) ((cua hang) or (cua dang)) cong dan chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((hanh trang) OR (hanh trinh)) ((cua hang) OR (cua dang)) cong dan chan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - ((hanh trang) OR (hanh trinh)) ((cua hang) or (cua dang)) cong dan chan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((hanh trang) OR (hanh trinh)) ((cua hang) or (cua dang)) cong dan chan ban*.