Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
phan luc » nhan luc, phan duc, phan suc
toc sach » hoc sach, doc sach, thuoc sach
thanh te » thanh ve, thanh de, thanh le
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va phan » van phan, va phat, va phap
luc van » luoc van, luu van, duc van
te cua » tue cua, le cua, de cua
x hoi » xa hoi, o hoi, 5 hoi

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang ((x hoi) OR (x ho)). hieu va phan luc van thanh te cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang ((x hoi) OR (x ho)). hieu va phan luc van thanh te cua vat~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang ((x hoi) OR (x ho)). hieu va phan luc van thanh te cua vat*.