Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
cham luc » cham soc, nhan luc, cham cuu
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
va cham » va chat, va tham
cua tuc » cua duc, cua tu, cua thuoc
luc va » duc va, tuc va, loc va
va han » va phan, van han, va hanh
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) OR (toc sach)) thu nang ((5 hoi) or (x ho)). hieu va cham luc va han tai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu nang ((5 hoi) OR (x ho)). hieu va cham luc va han tai cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thu nang ((5 hoi) or (x ho)). hieu va cham luc va han tai cua tuc".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) thu nang ((5 hoi) or (x ho)). hieu va cham luc va han tai cua tuc*.