Perhaps you should try some spelling variations:
thanh luu » thanh lieu, thanh ngu, thanh lap
thanh luc » than luc, nhan luc, thanh lap
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
ma hoi » xa hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang

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 v nang ((ma hoi) OR (mai hoi)). hieu van ((thanh luc) OR (thanh luu)) va hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang ((ma hoi) OR (mai hoi)). hieu van ((thanh luc) or (thanh luu)) va hanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((ma hoi) OR (mai hoi)). hieu van ((thanh luc) or (thanh luu)) va hanh hai cua tre*.