Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tong cong » cong cong, dung cong, dang cong
ho chieu » theo chieu, hoc thieu, doi chieu
trinh ve » trinh he, trinh va, trinh viet
trinh vi » trinh va, trinh viet, trinh van
dan toan » van toan, dan than, manh toan
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 ve) or (trinh vi)) ((tong cong) OR (trong cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trinh ve) OR (trinh vi)) ((tong cong) OR (trong cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trinh ve) or (trinh vi)) ((tong cong) OR (trong cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh ve) or (trinh vi)) ((tong cong) OR (trong cong)) dan toan cao*.