Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, theo sach
hieu cach » hieu cac, chieu sach, hieu ca
thanh hai » thanh phan, thanh hoa, thanh san
tam dang » nam dang, tam dan, tran dang
nong san » cong san, dong san, nong dan
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (hieu cach)) - thanh trung tam dang ((nong san) or (cong tan)) thanh hai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh trung tam dang ((nong san) OR (cong tan)) thanh hai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - thanh trung tam dang ((nong san) or (cong tan)) thanh hai".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - thanh trung tam dang ((nong san) or (cong tan)) thanh hai*.