Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
hieu sach » chieu sach, hieu cach, dien sach
trung cap » truong cao, trung tam
hang cong » dang cong, hang nong, bang cong
hieu cac » hieu luc, hieu va, hieu van
cap hang » cap hoang, cap bang, cap han
tan than » tan thanh, ban than, tam than

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 (hieu cac)) - manh trung cap hang cong ((tan than) OR (tan tran)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cac)) - manh trung cap hang cong ((tan than) OR (tan tran)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (hieu cac)) - manh trung cap hang cong ((tan than) OR (tan tran)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu cac)) - manh trung cap hang cong ((tan than) OR (tan tran)) cao*.