Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach kem
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
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.

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sach ty)) lang xa hoi. hieu van cau ((ac va) or (thuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach ty)) lang xa hoi. hieu van cau ((ac va) OR (thuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sach ty)) lang xa hoi. hieu van cau ((ac va) or (thuc va)) hanh vi cua tre*.