Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh tran » hanh trang, thanh tran, hanh tram
dinh dung » dinh hung, tinh dung, trinh dung
doc hieu » toc thieu, hoc thieu, hoc hien
song van » hoang van, trong van, duong van
van luan » van quan, van tuan, von luan
luan ban » luan van, luan san, luan han

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 xanh - hanh tran ((dinh dung) or (dinh duong)) song van luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tran ((dinh dung) OR (dinh duong)) song van luan ban*.