Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
sang cong » dang cong, bang cong, hang cong
lua sang » luc sang, bua sang, cua sang
cong tan » cong tac, cong san, cong thanh
thi lua » thi luan, thi dua, thi cua
tan phi » tac phi, tan phu, toan phai
phi thi » phi tai, chi thi, phi phi

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 sach) or (chieu tinh)) - hoang thi lua sang cong tan phi thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu tinh)) - hoang thi lua sang cong tan phi thi*.