Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
thieu sach » chieu sach, thien hach, hieu cach
trinh vatn » trinh van, trinh han, trinh san
duong manh » duong van
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
manh luan » manh tuan, manh quan, minh luan
luan ban » luan van, luan san, luan han

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: hoc thieu sach - hanh ((trinh vat) OR (trinh vatn)) nhung duong manh luan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh vat) or (trinh vatn)) nhung duong manh luan ban*.