Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
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: tu sach ky ((lang xa) OR (lang ha)) hoi. hieu van chat ((ac va) OR (tuc va)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) OR (lang ha)) hoi. hieu van chat ((ac va) or (tuc va)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) OR (lang ha)) hoi. hieu van chat ((ac va) or (tuc va)) hanh vi cua tre*.