Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cac lap » cac lop, cac cap, cac tap
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
te sach » toc sach
lap va » tap va
vi cua » vai cua, di cua
te sac » te cac, te san

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 sac) OR (te sach)) ky ((nang xa) OR (lang xa)) hoi. hieu van cac lap va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te sach)) ky ((nang xa) or (lang xa)) hoi. hieu van cac lap va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te sach)) ky ((nang xa) or (lang xa)) hoi. hieu van cac lap va hanh vi cua tre*.