Perhaps you should try some spelling variations:
nhan tien » nhan vien, nhan dien, phan tien
cua viet » ca viet, hoa viet, cua vat
tien cua » trien cua, tiep cua, dien cua
sach ky » sach y, sach ty, sach kem
va nhan » van nhan, ca nhan, va phan
cau luc » cau truc, cau phuc
qua cau » quan cau, qua cac, qua ca
hoa hoi » khoa hoi, hoa hoc, hoa doi
ho hoi » hoc hoi, hoi hoi, co hoi
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky

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) or (sac ky)) nang ((ho hoi) or (hoa hoi)). hieu qua cau luc va nhan tien cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ((ho hoi) OR (hoa hoi)). hieu qua cau luc va nhan tien cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ((ho hoi) or (hoa hoi)). hieu qua cau luc va nhan tien cua viet*.