Perhaps you should try some spelling variations:
nhan luc » nang luc
qua nhan » cua nhan, qua nhat, qua phan
hanh doi » thanh doi, hanh noi, hang doi
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky nang) OR (ki nang)) ma hoi. hieu qua nhan luc va hanh doi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky nang) or (ki nang)) ma hoi. hieu qua nhan luc va hanh doi ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky nang) or (ki nang)) ma hoi. hieu qua nhan luc va hanh doi ((cua tre) OR (cuu tre))*.