Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
canh trinh » hanh trinh, canh tinh, anh trinh
nhung dung » phuong dung, thong dung, trung dung
doi chieu » doc hieu, doi chi, ho chieu
toan chai » toan chi, toan chay, toan phai
chai tu » cai tu, choi tu, chay tu

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 tinh - ((canh trinh) or (canh tranh)) va ((nhung dung) or (ung dung)) toan chai tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tinh - ((canh trinh) OR (canh tranh)) va ((nhung dung) OR (ung dung)) toan chai tu.
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - ((canh trinh) or (canh tranh)) va ((nhung dung) or (ung dung)) toan chai tu*.