Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
tranh cua » doanh cua, manh cua
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
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: doi chieu sach - hanh ((tranh cua) or (trung cua)) ((tong cong) or (dung cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((tranh cua) OR (trung cua)) ((tong cong) OR (dung cong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((tranh cua) or (trung cua)) ((tong cong) or (dung cong)) tac toan cau*.