Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
ac va » tac va, bac va, mac 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: te sach ky ((nang x) OR (sang ma)) hoi. hieu van cam ((ac va) OR (truc va)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang x) or (sang ma)) hoi. hieu van cam ((ac va) or (truc va)) hanh vi cua tre*.