Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
bien tinh » yen tinh, diep tinh, ban tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
bi tinh » vi tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (((bien tinh) OR (bi tinh)))) - hanh tang luan nang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (((bien tinh) OR (bi tinh)))) - hanh tang luan nang cong dan than cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (((bien tinh) OR (bi tinh)))) - hanh tang luan nang cong dan than cau*".