Perhaps you should try some spelling variations:
khong hoang » khung hoang, thong hoang, khong hoan
chieu sach » chinh sach, chiet tach, chieu sang
khoa khong » khoi khong, hoa khong, khon khong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh toan » thanh toan, khanh toan, manh toan
hoang van » hang va
van tuan » van quan, van ban, anh tuan
tuan ban » tuan bang, toan ban, luan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu sach)) - hanh toan khoa khong hoang van tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sach)) - hanh toan khoa khong hoang van tuan ban*.