Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tranh tai » tranh thai, trinh tai, thanh tai
dung tri » dung tai, dung tren, dung sai
thu canh » thuc hanh, thu cong, thu ban
thu sach » tu sach, thuoc sach, thu hoach
luan tri » quan tri, luat tri, quang tri
luan thi » luan chi, luan thiet, luyen thi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((( thuat sach dung tri ) OR ( thu canh tranh tai ))) OR ( thu sach ((luan tri) OR (luan thi)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( thuat sach dung tri ) or ( thu canh tranh tai ))) or ( thu sach ((luan tri) OR (luan thi)) ))~".
• Adding a wildcard symbol may retrieve word variants: (((( thuat sach dung tri ) or ( thu canh tranh tai ))) or ( thu sach ((luan tri) OR (luan thi)) ))*.