Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
duc manh » suc manh, duc anh, duc minh
hieu van » hieu va, thien van, lieu va
cao hoi » cau hoi, co hoi, cao hoc
sach ky » sac ky, sach y, sach kem
van cac » van hac, van cau, van bac
xuc van » duc van, luc van, vuc van
sach ty » sach y, sach tu, sach thu
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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: thu ((sach ky) OR (sach ty)) nang cao hoi. hieu van cac ((xuc van) OR (duc manh)) hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang cao hoi. hieu van cac ((xuc van) or (duc manh)) hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang cao hoi. hieu van cac ((xuc van) or (duc manh)) hanh tai cua tre*.