Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
cac luc » cau luc, coc luc, cac nuoc
hanh di » hanh vi, hanh de, hang di
nang xa » lang xa, nang ma, mang xa
va hanh » van hanh, va thanh, va danh
qua cac » cua cac
di cua » dai cua, doi cua, de cua
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach thu) or (sach tham)) ((nang xa) OR (nang x)) hoi. hieu qua cac luc va hanh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach thu) OR (sach tham)) ((nang xa) OR (nang x)) hoi. hieu qua cac luc va hanh di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach thu) or (sach tham)) ((nang xa) OR (nang x)) hoi. hieu qua cac luc va hanh di cua tu".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach thu) or (sach tham)) ((nang xa) OR (nang x)) hoi. hieu qua cac luc va hanh di cua tu*.