Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thiet ngan » hiem ngan, thien nga, thien nhan
dung cong » dung trong
thi ngan » tai ngan, thu ngan, thi nga
anh tang » anh bang, anh dang, anh nang
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet ngan) or (thi ngan)) - ((hanh trinh) or (anh tang)) cua dung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet ngan) OR (thi ngan)) - ((hanh trinh) OR (anh tang)) cua dung cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet ngan) or (thi ngan)) - ((hanh trinh) or (anh tang)) cua dung cong dan van ban*.