Perhaps you should try some spelling variations:
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh
van cong » van dong, van phong, phan cong
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo yeu tinh - hanh tang luan van cong ((dan than) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo yeu tinh - hanh tang luan van cong ((dan than) OR (van toan)) cau*.