Perhaps you should try some spelling variations:
hoan chinh » hanh chinh, hoa hinh
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
ho chinh » hoc chinh, cho chinh, hoa chinh
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
tac ran » tac can, tac van, tac quan
ran cau » van cau, ban cau, can cau

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chinh) OR (hoan chinh)) sach - hanh trinh va nhung cong tac ran cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chinh) OR (hoan chinh)) sach - hanh trinh va nhung cong tac ran cau*.