Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien sach » dien sach, kien sach, thien hach
tranh cua » doanh cua, manh cua
cua tong » cua cong, cua dong, cua nong
cong tan » cong tac, cong san, cong thanh
song van » hoang van, trong van, duong van
han tap » han tai, toan tap, nhan tai

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 tranh cua tong ((cong tan) or (song van)) han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh tranh cua tong ((cong tan) OR (song van)) han tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh tranh cua tong ((cong tan) or (song van)) han tap*.