Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doi chi, ho chieu, mot chieu
luat tong » luat trong, luat thong, luat cong
hoang van » hang va
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, cong san, song van
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) sach - hanh trinh luat tong ((cong van) or (hoang van)) van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - hanh trinh luat tong ((cong van) OR (hoang van)) van cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - hanh trinh luat tong ((cong van) or (hoang van)) van cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - hanh trinh luat tong ((cong van) or (hoang van)) van cau*.