Perhaps you should try some spelling variations:
chieu tinh » lieu tinh, chau tinh, kieu tinh
thong cong » trong cong, tong cong, thong thong
tranh cam » trinh cam, tranh cac, tranh cai
thanh cac » hanh cac, thanh bac, thanh ca
cong tac » cong ty
hoa chat » hop chat, hoa phan
tac hoa » tap hoa, tac ha, lac hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu tinh) OR (trieu tinh)) - canh ((tranh cam) or (thanh cac)) thong cong tac hoa chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (trieu tinh)) - canh ((tranh cam) OR (thanh cac)) thong cong tac hoa chat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu tinh) OR (trieu tinh)) - canh ((tranh cam) or (thanh cac)) thong cong tac hoa chat".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) OR (trieu tinh)) - canh ((tranh cam) or (thanh cac)) thong cong tac hoa chat*.