Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
luan tong » luan tuong, luan dong, luan nong
luan cong » luat cong, luong cong, luan chung
cong tap » cuong tap, cong tac, cong tan
tap doan » tap quan
doan cao » doanh cao, toan cao, doan cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (hieu lang)) - hanh tang ((luan tong) OR (luan cong)) cong tap doan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu lang)) - hanh tang ((luan tong) OR (luan cong)) cong tap doan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (hieu lang)) - hanh tang ((luan tong) OR (luan cong)) cong tap doan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu lang)) - hanh tang ((luan tong) OR (luan cong)) cong tap doan cao*.