Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trinh » canh tranh, hanh trinh, canh tinh
thong tac » thong cac, tuong tac, thong tai
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
tac pham » thuc pham, san pham
pham tu » phan tu, pham thi, pham tai

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - canh trinh va thong thong tac pham tu~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu sang)) - canh trinh va thong thong tac pham tu*.