Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
hieu cua » hieu qua, dieu cua, bieu cua
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
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 hoi. hieu cua cac duc 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 hoi. hieu cua cac duc va hanh di cua tu.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach thu) or (sach tham)) nang xa hoi. hieu cua cac duc va hanh di cua tu*.