Perhaps you should try some spelling variations:
chiet tach » chieu sach
trinh hanh » trinh thanh, trinh han, trinh hinh
nhung cong » dung cong, thong cong, hang cong
trinh anh » trinh thanh, trinh kinh, trinh dinh
ho chiet » ho chieu, ho thiet, hoc thiet
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - hanh ((trinh hanh) or (trinh anh)) nhung cong dan ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((trinh hanh) OR (trinh anh)) nhung cong dan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh ((trinh hanh) or (trinh anh)) nhung cong dan ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((trinh hanh) or (trinh anh)) nhung cong dan ((toan cau) OR (toan tap))*.