Perhaps you should try some spelling variations:
qua nhan » cua nhan, qua nhat, qua phan
nhan luc » nang luc
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
va hang » van hang, va nang, va hanh
va lang » va nang, hoa lang
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu qua nhan luc ((va hang) OR (va lang)) doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu qua nhan luc ((va hang) OR (va lang)) doi cua tre*.