Perhaps you should try some spelling variations:
thong quang » thong qua, luong quang, thong dung
hanh doanh » hang doanh, chinh doanh, doanh doanh
chieu sach » chinh sach, chiet tach, chieu sang
hieu sach » hieu cach, dien sach, hieu cac
doanh cua » doanh luan
thien van » thi van
cua dung » cua dang, cua dong, qua dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (chieu sach)) - hanh doanh cua dung ((thong quang) OR (thong quan)) thien van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (chieu sach)) - hanh doanh cua dung ((thong quang) OR (thong quan)) thien van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (chieu sach)) - hanh doanh cua dung ((thong quang) OR (thong quan)) thien van".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (chieu sach)) - hanh doanh cua dung ((thong quang) OR (thong quan)) thien van*.