Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 nganh) or (chieu sach)) - hanh tang luan nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu nganh) OR (chieu sach)) - hanh tang luan nhung cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu nganh) or (chieu sach)) - hanh tang luan nhung cong dan toan cao*.