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 » dang cong, hang nong, bang cong
tinh cua » trinh cua, sinh cua, tinh chat
van toan » van tuan, van tan, van thanh
van quan » van ban
sinh va » sinh vat, tinh va, dinh van

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 ((tinh cua) or (sinh va)) hang cong ((van toan) or (van quan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((tinh cua) OR (sinh va)) hang cong ((van toan) OR (van quan)) tap.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((tinh cua) or (sinh va)) hang cong ((van toan) or (van quan)) tap*.