Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, hieu ca, biet cach
ca nhung » cua nhung, cam nhung, va nhung
san phan » san pham, van phan, dan phan
sat phan » sat nhan, vat phan, xuat phan
tung ca » trung ca, tang ca, cung ca

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

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