Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van cua » vang cua, ban cua, dan cua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: tu sach y nang x hoi. ((hieu ve) or (hieu va)) cham luc ((va danh) OR (va hanh)) van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu ve) OR (hieu va)) cham luc ((va danh) OR (va hanh)) van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu ve) or (hieu va)) cham luc ((va danh) OR (va hanh)) van cua tre*".