Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh vat » trinh van, trinh luat, sinh vat
thau dau » phan dau, chau au
dau sach » cau sach, dat sach, hau sach
vat dang » van dang, vat dung, va dang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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: thau dau sach - hanh trinh vat dang ((cong dan) OR (cong san)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: thau dau sach - hanh trinh vat dang ((cong dan) or (cong san)) toan cau*.