Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thuc thanh » thuoc thanh, thuc hanh, phuc thanh
tran dung » tran dang, tran hung, tran quang
cong thuc » cong tac
thanh ban » thanh san, thanh van, thanh bac
ho chieu » theo chieu, hoc thieu, mot chieu
tan dung » tin dung, van dung, dan dung

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 trung ((tan dung) or (tran dung)) cong thuc thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung ((tan dung) OR (tran dung)) cong thuc thanh ban.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung ((tan dung) or (tran dung)) cong thuc thanh ban*.