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
han thai » han tai, ban thai, van thai
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
tuc va » thuc va, truc va, tuc xa
va han » va phan, van han, va hanh
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi
5 hoi » o 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 (5 hoi))) or (x ho)). hieu cua nhan tuc va han thai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang ((((x hoi) OR (5 hoi))) OR (x ho)). hieu cua nhan tuc va han thai cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach thu nang ((((x hoi) or (5 hoi))) or (x ho)). hieu cua nhan tuc va han thai cua tu*.