Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhiet nang » nhiet dong, viet nang, nhieu tang
dung cong » dung trong
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (nhiet nang)) - ((thanh tung) OR (thanh cong)) va dung cong bai toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu tinh) or (nhiet nang)) - ((thanh tung) OR (thanh cong)) va dung cong bai toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (nhiet nang)) - ((thanh tung) OR (thanh cong)) va dung cong bai toan cao*.