Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
cham luc » cham soc, nhan luc, cham cuu
te sach » toc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
van tai » von tai, van tuan
cua tuc » cua duc, cua thuoc, luat tuc
luc va » duc va, tuc va, loc va
cua tu » cua su, cua cu, cua te
x hoi » xa hoi, o hoi, 5 hoi

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

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