Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
tranh cua » manh cua
doanh cua » doanh luan
dang cong » dung cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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 cach) or (chieu sach)) - canh ((tranh cua) OR (doanh cua)) dang cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu cach) OR (chieu sach)) - canh ((tranh cua) OR (doanh cua)) dang cong san toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cach) or (chieu sach)) - canh ((tranh cua) OR (doanh cua)) dang cong san toan cao*".