Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luc ngan » luc nganh, luc nhan, luat ngan
cau tren » cu tren, dau tren, ca tren
xang xa » ang xa, dang xay, xang dau
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
ve cau » ke cau, va cau, ve cac
vi cau » va cau, di cau, viet cau

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

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