Perhaps you should try some spelling variations:
nhan luc » nang luc
van nhan » van phan, van thanh, danh nhan
nhan tai » hang tai, van tai, toan tai
duc tien » duc thien, luc tieng, thuc tien
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu va, hieu van
ve nhan » ve nha, de nhan, va nhan
luc van » luoc van, luu van, duc van
cuc tre » duc tre, cua tre, cuu tre
ma hoi » mai hoi, xa hoi, ma hoa

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 ky dang ma hoi. hieu ve nhan luc van nhan tai ((cuc tre) or (duc tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ma hoi. hieu ve nhan luc van nhan tai ((cuc tre) OR (duc tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ma hoi. hieu ve nhan luc van nhan tai ((cuc tre) or (duc tien))*.