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, vu sach
truc va » thuc va, thuc vat, trung va
hai cua » thai cua, dai cua, hoi cua
sach ty » sach y, sach tu, sach thu
van lam » van nam
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
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 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 ty nang ma hoi. hieu van lam ((luc va) or (truc va)) hanh hai cua tre*.