Perhaps you should try some spelling variations:
thanh tung » thanh cong
tuan trong » thuan trong, quan trong, tran trong
trong dong » trong cong, trong nong, trong dang
dong doanh » dung doanh, trong doanh, doanh doanh
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
tung tuan » trung tuan, hung tuan, quang tuan
phan cau » phan dau, phan cac, phan lap

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 (dien sach)) - thanh tung tuan trong dong doanh ((phan cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (dien sach)) - thanh tung tuan trong dong doanh ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) OR (dien sach)) - thanh tung tuan trong dong doanh ((phan cau) or (phan tu))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) OR (dien sach)) - thanh tung tuan trong dong doanh ((phan cau) or (phan tu))*.