Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh hanh » trinh thanh, trinh anh, trinh hinh
trinh han » trinh quan
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong thanh, cong ty
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - hanh ((trinh hanh) or (trinh han)) nhung ((cong tan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trinh hanh) OR (trinh han)) nhung ((cong tan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh hanh) or (trinh han)) nhung ((cong tan) or (cong san)) toan cau*.