Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh han
trinh than » trinh thanh, trinh han, trinh toan
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
than cau » toan cau, phan cau, than cap

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 quan) or (trinh luat)) ((dong cong) OR (dang cong)) trinh than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trinh quan) OR (trinh luat)) ((dong cong) OR (dang cong)) trinh than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trinh quan) or (trinh luat)) ((dong cong) OR (dang cong)) trinh than cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh quan) or (trinh luat)) ((dong cong) OR (dang cong)) trinh than cau*.