Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
nhan dang » nhan dan, phan dang, tran dang
dang luan » dung luan, tang luan, hang luan
luan dong » luan cong, quan dong, luan nong
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc hien
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc thieu)) tinh - nhan dang luan dong cong ((dan than) or (van ban)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) tinh - nhan dang luan dong cong ((dan than) OR (van ban)) cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) tinh - nhan dang luan dong cong ((dan than) or (van ban)) cau*.