Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
lua trong » luat trong, qua trong, luu trong
hoa chat » hop chat, hoa phan
chat lua » chat cua, chat va, chat huu
cong tan » cong tac, cong san, cong thanh
tan dat » dan dat, ban dat, tan dac
dat may » dam may

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) or (chieu tinh)) - hoa chat lua trong cong tan dat may~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu tinh)) - hoa chat lua trong cong tan dat may*.