Perhaps you should try some spelling variations:
thanh luan » tranh luan, thanh xuan, thanh tuan
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
van nhung » van nhuong, va nhung, van hung
sach thai » sach tham, sac thai, sach nha
ho chieu » theo chieu, doi chieu, mot chieu
sach tai » sach bai, sach tham, sach dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - thanh luan van nhung cong ((sach thai) OR (sach tai)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - thanh luan van nhung cong ((sach thai) OR (sach tai)) cao~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - thanh luan van nhung cong ((sach thai) OR (sach tai)) cao*.