Perhaps you should try some spelling variations:
tranh tren » trinh tren, tran tren, tranh trong
tren hoang » tran hoang, tien hoang, tuan hoang
kinh sach » dinh sach, tinh sach, chinh sach
sinh sach » chinh sach, sinh san, sang sach
vuong san » xuong san, duong san, luong san
san than » sang than, san thanh, ban than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((kinh sach) or (sinh sach)) - canh tranh tren hoang vuong san than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((kinh sach) OR (sinh sach)) - canh tranh tren hoang vuong san than cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((kinh sach) or (sinh sach)) - canh tranh tren hoang vuong san than cap*.