Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trinh » canh tranh, hanh trinh, canh tinh
nhung song » nhung cong, nhung bong, nhung chong
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
song luan » tong luan, cong luan, dong luan
luan phan » luan van, luan hoan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - canh trinh vat nhung song luan phan tu~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - canh trinh vat nhung song luan phan tu*.