Perhaps you should try some spelling variations:
hien sach » dien sach, kien sach, thien hach
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong vang » cong lang, cong quang, cong ngang
cong van » cong san, song van, cong tan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 - canh tranh cua nhung ((cong van) or (cong vang)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - canh tranh cua nhung ((cong van) OR (cong vang)) ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - canh tranh cua nhung ((cong van) or (cong vang)) ((toan cau) or (toan ban))*.