Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
luu tre » luu tru, cuu tre, luy tre
va cau » van cau, va cac, va cao
va dau » va dao
luc va » duc va, tuc va, loc va
va luu » van luu, ta luu, vi luu
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: su sach thu nang ((x hoi) or (x ho)). hieu ((va cau) or (va dau)) luc va tinh va luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ((x hoi) OR (x ho)). hieu ((va cau) OR (va dau)) luc va tinh va luu tre.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ((x hoi) or (x ho)). hieu ((va cau) or (va dau)) luc va tinh va luu tre*.