Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
dau tren » dau tien, dat tren, dau tieng
lang xa » dang xay, lang van
lang ha » long ha
qua cau » quan cau, qua cac, qua ca
hanh va » hang va, hanh vi
va dau » va dao

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) OR (lang ha)) hoi. hieu qua cau truc van hanh va dau tren~".
• Adding a wildcard symbol may retrieve word variants: thuat sach _ ((lang xa) OR (lang ha)) hoi. hieu qua cau truc van hanh va dau tren*.