Perhaps you should try some spelling variations:
dung truong » duong truong, dung trong, dung trung
truong luan » truong quan, truong luat, truong quang
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
tang luan » dung luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - hanh ((trung cua) or (tang luan)) dung truong luan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trung cua) OR (tang luan)) dung truong luan van ban*.