Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
su sach » so sach
hai cua » thai cua, dai cua, hoi cua
truc va » thuc va, thuc vat, trung va
van lam » van nam
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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