Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh ve » hanh ve, thanh va, thanh vien
cau tren » cu tren, dau tren, ca tren
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
xang xa » lang xa, ang xa, dang xay
luc va » duc va, tuc va, loc va
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((xang xa) OR (mang xa)) hoi. hieu va cau luc va ((thanh ve) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((xang xa) OR (mang xa)) hoi. hieu va cau luc va ((thanh ve) OR (hanh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((xang xa) OR (mang xa)) hoi. hieu va cau luc va ((thanh ve) or (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((xang xa) OR (mang xa)) hoi. hieu va cau luc va ((thanh ve) or (hanh vi)) cau tren*.