Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
lang van » dang van, tang van, hoang van
sach lo » sach dao, sach doi, sach moi
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
cua te » cua tu

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 lo) or (sach hoi)) lang van hoa. hieu qua cau luc va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lo) OR (sach hoi)) lang van hoa. hieu qua cau luc va hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach lo) or (sach hoi)) lang van hoa. hieu qua cau luc va hanh di cua te*.