Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu cua » hieu qua, dieu cua, bieu cua
cua nhan » ca nhan, cua ngan, cua nha
nhan tuc » nhan thuc, nhan luc, nhanh thuc
te sach » toc sach
han tai » hang tai, nhan tai, van tai
tuc va » thuc va, truc va, tuc xa
va han » va phan, van han, va hanh
cuc tu » cuc du, luc tu, duc tu
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 cua nhan tuc va han tai cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang ((x hoi) OR (x ho)). hieu cua nhan tuc va han tai cuc tu.
• Adding a wildcard symbol may retrieve word variants: te sach thu nang ((x hoi) or (x ho)). hieu cua nhan tuc va han tai cuc tu*.