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
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
hang vi » hang va, hang di, khang voi
ve cau » ke cau, va cau, ve cac

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