Perhaps you should try some spelling variations:
hieu sach » chieu sach, dien sach, hieu cac
hieu cach » hieu cac, chieu sach, hieu ca
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
tap quan » tac quan
hai quan » tac quan

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 cach)) - canh tranh cua hang cong ((tap quan) OR (hai quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cach)) - canh tranh cua hang cong ((tap quan) OR (hai quan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (hieu cach)) - canh tranh cua hang cong ((tap quan) OR (hai quan)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu cach)) - canh tranh cua hang cong ((tap quan) OR (hai quan)) cao*.