Perhaps you should try some spelling variations:
qua nhan » cua nhan, qua nhat, qua phan
nhan luc » nang luc
van doan » van doanh, van toan, van hoan
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
va doan » va doanh, va dan, va don
y nang » ky nang, v nang, may nang
va cua » va chua, via cua, ca cua

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) or (ly nang)) xa hoi. hieu qua nhan luc ((va doan) OR (van doan)) va cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. hieu qua nhan luc ((va doan) OR (van doan)) va cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ly nang)) xa hoi. hieu qua nhan luc ((va doan) OR (van doan)) va cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly nang)) xa hoi. hieu qua nhan luc ((va doan) OR (van doan)) va cua vat*.