Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
ban khoan » toan khoan, cac khoan, san khoa
khoan cam » khoa cam, khoan va, phan cam
trung va » truong va, trang va, trung ha
cong ban » cong bang, cong san, cong tan

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 xanh - thanh ((trung va) or (truong cao)) nhung cong ban khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - thanh ((trung va) OR (truong cao)) nhung cong ban khoan cam*.