Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, bac trung
trung va » truong va, trang va, trung ha
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
danh vi » dinh vi, danh di, danh va
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang

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: ((su sach) OR (so sanh)) y nang xa hoi. hieu van cac trung va ((danh vi) OR (hanh vi)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y nang xa hoi. hieu van cac trung va ((danh vi) OR (hanh vi)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang xa hoi. hieu van cac trung va ((danh vi) OR (hanh vi)) cuu tre*.