Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hanh trung » thanh trung, manh trung, danh trung
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, hoang manh
toan ban » van ban
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 trung) or (hanh trang)) va nhung ((cong manh) OR (cong thanh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh trung) OR (hanh trang)) va nhung ((cong manh) OR (cong thanh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh trung) or (hanh trang)) va nhung ((cong manh) OR (cong thanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh trung) or (hanh trang)) va nhung ((cong manh) OR (cong thanh)) toan ban*.