Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
dang cong » dung cong
hoa chat » hop chat, hoa phan
chat lua » chat cua, chat va, chat huu
lua dang » cua dang, lua sang, luan nang
cong dan » cong san, cong tan, huong dan
dan thi » dang thi, tran thi, dinh thi
thi phi » chi phi, phi phi, thi phu

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 dang cong dan thi phi~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu tinh)) - hoa chat lua dang cong dan thi phi*".