Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
khanh luan » khanh thuan, doanh luan, hang luan
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
tran tap » toan tap, tran tan, tran tuan
luan va » luan van, luat va

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) or (hieu lang)) - khanh luan va ((nhung cong) or (dang cong)) tan tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (hieu lang)) - khanh luan va ((nhung cong) OR (dang cong)) tan tran tap.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (hieu lang)) - khanh luan va ((nhung cong) or (dang cong)) tan tran tap*.