Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
da cau » dat cau
va cau » van cau, va cac, va dau
x hoi » o hoi, x ho, 5 hoi

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) OR (xa hoi)). lieu va cham luc va hanh ((da cau) or (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (xa hoi)). lieu va cham luc va hanh ((da cau) OR (va cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (xa hoi)). lieu va cham luc va hanh ((da cau) or (va cau)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (xa hoi)). lieu va cham luc va hanh ((da cau) or (va cau)) tren*.