Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
doanh doan » doanh doanh, doanh hoan, doanh nhan
quan nhung » qua nhung, luan chung, quang hung
cua nhung » va nhung
trong van » trong cac
van tan » van tuan, van ban, van tai
tan cau » toan cau, van cau, tan ca

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)) - doanh doan ((quan nhung) OR (cua nhung)) trong van tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - doanh doan ((quan nhung) OR (cua nhung)) trong van tan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - doanh doan ((quan nhung) OR (cua nhung)) trong van tan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - doanh doan ((quan nhung) OR (cua nhung)) trong van tan cau*.