Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
hanh di » hanh vi, hanh de, hang di
qua cac » cua cac
nang xa » nang x, lang xa, nang ma
loc va » hoc va
luc va » duc va, tuc va
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 thue)) nang xa hoi. hieu qua cac ((loc va) OR (luc va)) hanh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach thu) OR (sach thue)) nang xa hoi. hieu qua cac ((loc va) OR (luc va)) hanh di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach thu) or (sach thue)) nang xa hoi. hieu qua cac ((loc va) OR (luc va)) hanh di cua tu".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach thu) or (sach thue)) nang xa hoi. hieu qua cac ((loc va) OR (luc va)) hanh di cua tu*.