Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
dung cong » dung trong
hoa chat » hop chat, hoa phan
chat lua » chat cua, chat va, chat huu
lua dung » qua dung, luan hung, qua duong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van
van tan » van tuan, van ban, van tai

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 dung cong tan van tan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu tinh)) - hoa chat lua dung cong tan van tan.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chieu tinh)) - hoa chat lua dung cong tan van tan*.