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 » doanh cua, manh cua
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (hieu cach)) - canh tranh cua dung cong ((tan toan) or (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu cach)) - canh tranh cua dung cong ((tan toan) OR (tap toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu cach)) - canh tranh cua dung cong ((tan toan) or (tap toan)) cao*.