Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhieu tang » chieu sang, hieu lang, nhiet nang
tran phung » tran phuong, trang phung, tran hung
phung cong » nhung cong, phong cong, nhung chong
quan tran » quang tran, quan tren, xuan tran
anh quan » anh tuan, ban quan, anh nhan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan 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 ((chiet tach) or (nhieu tang)) - anh quan tran phung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (nhieu tang)) - anh quan tran phung cong tap toan cau*.