Perhaps you should try some spelling variations:
luc ngan » luc nganh, luc nhan, luat ngan
tu sach » thu sach, su sach, te sach
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
cau luc » cau truc, cau phuc
sach ty » sach y, sach tu, sach thu
ca tren » cau tren, cu tren, la tren
hieu ke » hieu kem, chieu ke, hieu ky
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
ke cau » ket cau

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

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