Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
cau tuc » cau truc, cau luc, cau phuc
xa hanh » xa thanh, xa khanh, va hanh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cau tu » dau tu, cau truc
va cua » va chua, via cua, ca cua

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: so sach y nang x ho. ((hieu van) OR (thien van)) ((cau tuc) OR (cau tu)) xa hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang x ho. ((hieu van) OR (thien van)) ((cau tuc) or (cau tu)) xa hanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang x ho. ((hieu van) OR (thien van)) ((cau tuc) or (cau tu)) xa hanh va cua tre*.