Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban hanh » ban hang
dau tren » dau tien, dau tieng, dau trong
dat tren » dat trong, dua tren
lang xa » lang ha, dang xay, lang van
qua cau » quan cau, qua cac, qua ca
cau xuc » cam xuc, cau luc, cau truc
xuc ban » duc ban, cuc ban, quoc ban

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach _ lang xa hoi. hieu qua cau xuc ban hanh vi ((dau tren) OR (dat tren))~".
• Adding a wildcard symbol may retrieve word variants: thuat sach _ lang xa hoi. hieu qua cau xuc ban hanh vi ((dau tren) OR (dat tren))*.