Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
hieu va » lieu va, hieu qua
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
cam luc » cam xuc, cau luc
luu tre » luu tru, cuu tre, luy tre
va cam » va cham, va cac, va cao
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: ((te sach) or (toc sach)) thu nang ((x hoi) or (x ho)). hieu va cam luc va tinh va luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu nang ((x hoi) OR (x ho)). hieu va cam luc va tinh va luu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) thu nang ((x hoi) or (x ho)). hieu va cam luc va tinh va luu tre*.