Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
trinh ve » trinh he, trinh vi, trinh viet
trinh va » trinh van, trinh vat, trinh vi
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: doi chieu sach - hanh ((trinh ve) OR (trinh va)) ((hang cong) or (dang cong)) tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh ve) OR (trinh va)) ((hang cong) OR (dang cong)) tinh toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((trinh ve) OR (trinh va)) ((hang cong) or (dang cong)) tinh toan cao*".