Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
cong than » cong thanh, cong thang, cong tan
than phan » thanh phan, toan phan, thanh pham
hoa chat » hop chat, hoa phan
chat lua » chat cua, chat va, chat huu
lua dang » cua dang, lua sang, luan nang
phan tap » phan lap, han tap, pha tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (chieu tinh)) - hoa chat lua dang cong than phan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (chieu tinh)) - hoa chat lua dang cong than phan tap*".