Perhaps you should try some spelling variations:
tham luoc » tham nuoc, tom luoc, khai luoc
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
van tham » van thanh, van tuan, van chat
sach ly » sach y, sach lo, sach hay
sach ty » sach y, sach tu, sach thu
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
x hoi » o hoi, x ho, 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: toc ((sach ly) OR (sach ty)) nang ((x hoi) OR (xa hoi)). hieu van tham luoc van hanh lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ly) OR (sach ty)) nang ((x hoi) or (xa hoi)). hieu van tham luoc van hanh lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ly) OR (sach ty)) nang ((x hoi) or (xa hoi)). hieu van tham luoc van hanh lai cua tre*.