Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trinh van » trinh han, trinh toan, dinh van
dan toan » van toan, dan than, manh toan

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

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