Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tran van » luan van
trang va » hang va
vu sach » vu bach, su sach, vu khach
danh da » danh dau, dan da, danh ca
van cac » van hac, van cau, van bac
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
da cu » da cau, dan cu, da 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: ((vu sach) OR (so sanh)) y nang xa hoi. hieu van cac ((trang va) OR (tran van)) danh da cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sanh)) y nang xa hoi. hieu van cac ((trang va) OR (tran van)) danh da cu tren~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) y nang xa hoi. hieu van cac ((trang va) OR (tran van)) danh da cu tren*.