Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
canh thanh » canh tranh, danh thanh, anh thanh
thanh hong » thanh huong, thanh hoang, thanh cong
hong thai » cong thai, hong ha, hinh thai
cong tac » cong ty
so sach » so sanh, bo sach, co sach
te canh » ve canh, te danh, re canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tranh cong tac đong luc ) or ( te canh thanh hong thai đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tranh cong tac đong luc ) OR ( te canh thanh hong thai đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tranh cong tac đong luc ) or ( te canh thanh hong thai đong luc ))*.