Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, bac trung
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, cau treo
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
ca tren » cu tren, la tren, co tren
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 di ((cau tren) OR (ca tren))~.
• 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 di ((cau tren) OR (ca tren))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang xa hoi. hieu van cac trung va danh di ((cau tren) OR (ca tren))*.