Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hai tuc » thai tuc, hai cuc, thai thuc
xa hanh » xa thanh, xa khanh, va hanh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
su sac » su cac, su xac
ma hoi » mai hoi, xa hoi, ma hoa

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: ((su sac) OR (su sach)) ky nang ma hoi. ((hieu van) OR (lieu va)) hai tuc xa hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su sach)) ky nang ma hoi. ((hieu van) or (lieu va)) hai tuc xa hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su sach)) ky nang ma hoi. ((hieu van) or (lieu va)) hai tuc xa hanh tai cua tre*.