Perhaps you should try some spelling variations:
hien sach » dien sach, kien sach, thien hach
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
tang cua » mang cua, hang cua, tang luan
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hanh tang cua nhung ((cong ban) or (cong san)) than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh tang cua nhung ((cong ban) OR (cong san)) than man.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh tang cua nhung ((cong ban) or (cong san)) than man*.