Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trinh » canh tranh, hanh chinh
luat chung » luan chung, cua chung, luat cong
phuong bac » phuong cach, phuong tay, phuong mai
bac than » bac thanh, bac thang, ban than
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chieu sang)) - hanh trinh ((luat chung) or (luat thuong)) phuong bac than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh trinh ((luat chung) OR (luat thuong)) phuong bac than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - hanh trinh ((luat chung) or (luat thuong)) phuong bac than ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - hanh trinh ((luat chung) or (luat thuong)) phuong bac than ban*.