Perhaps you should try some spelling variations:
khanh thuan » khanh thuong, thanh tuan, khan than
dong huong » dong thuong, dong duong, cong huong
tieu xanh » tieu danh, chieu xanh, dieu hanh
khau luan » khoa luan, phap luan, pham luan
dan toan » van toan, dan than, manh toan
toan cau » 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: theo tieu xanh - ((khau luan) or (khanh thuan)) van dong huong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((khau luan) OR (khanh thuan)) van dong huong dan toan cau*.