Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu kem » hieu ky, hieu ve
luc ngan » luc nganh, luc nhan, luat ngan
te sach » toc sach
xang xa » lang xa, mang xa, ang xa
kem cau » ket cau, ke cau, kem chu
cau luc » cau truc, cau phuc
hang vi » hang va, hang di, khang voi
ca tren » cau tren, cu tren, la tren

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) or (te sach)) ty xang xa hoi. hieu kem cau luc ngan ((hang vi) or (hanh vi)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ty xang xa hoi. hieu kem cau luc ngan ((hang vi) OR (hanh vi)) ca tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ty xang xa hoi. hieu kem cau luc ngan ((hang vi) or (hanh vi)) ca tren*.