Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
cac dung » cach dung, cac duong, cac dang
tac dung » sach dung, xay dung, tin dung
ban tran » ban trang, ban than, bao tran

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 - thanh trong ((cac dung) OR (tac dung)) cong ((ban tran) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trong ((cac dung) OR (tac dung)) cong ((ban tran) OR (tan tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh trong ((cac dung) OR (tac dung)) cong ((ban tran) or (tan tran)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trong ((cac dung) OR (tac dung)) cong ((ban tran) or (tan tran)) cau*.