Perhaps you should try some spelling variations:
chon chinh » cho chinh, chinh chinh, thong chinh
thon chinh » thong chinh, thuong chinh, thien chinh
dung cong » dung trong
tran manh » tran minh, tran thanh, tran van
hanh han » hanh nhan, hanh phan, hanh san
cong tac » cong ty
va dung » van dung, va duong, vat dung
than ma » than man, than va, khan ma
han va » hang va, hanh va, nhan va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((chon chinh) OR (thon chinh)) sach - hanh han va dung cong tac ((tran manh) OR (than ma))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((chon chinh) OR (thon chinh)) sach - hanh han va dung cong tac ((tran manh) or (than ma))~".
• Adding a wildcard symbol may retrieve word variants: ((chon chinh) OR (thon chinh)) sach - hanh han va dung cong tac ((tran manh) or (than ma))*.