Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cau tren » dau tren, ca tren, cau treo
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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