Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tran » hanh trang, thanh tran, hanh tram
nang cong » nang song, dang cong, bang cong
ho chieu » theo chieu, hoc thieu, doi chieu
tran van » luan van
van nang » van quang, van ban, van dong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh tran van nang cong ((dan toan) OR (dan than)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh tran van nang cong ((dan toan) OR (dan than)) cau*.