Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » tuc va, loc va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang x hoi. ((hieu ve) or (hieu va)) cau ((luc va) OR (duc va)) danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. ((hieu ve) OR (hieu va)) cau ((luc va) OR (duc va)) danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. ((hieu ve) or (hieu va)) cau ((luc va) OR (duc va)) danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu ve) or (hieu va)) cau ((luc va) OR (duc va)) danh vi cua tre*.