Perhaps you should try some spelling variations:
chiet tach » chieu sach
trinh van » trinh han, trinh quan, trinh toan
ho chiet » ho chieu, ho thiet, hoc thiet
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
tinh va » tich va, trinh vat, tinh gia

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: ho chiet tach - hanh ((tinh va) OR (trinh van)) nhung ((cong tan) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh ((tinh va) OR (trinh van)) nhung ((cong tan) or (cong san)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((tinh va) OR (trinh van)) nhung ((cong tan) or (cong san)) toan cau*.