Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan dang » luan nang, luan danh, luan dong
dang cong » dung cong
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chuc nang) or (hieu lang)) - hanh tang luan dang cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chuc nang) OR (hieu lang)) - hanh tang luan dang cong dan chan cau*.