Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
bat hanh » bat khanh, ban hanh, bao hanh
nhan luc » nang luc
luc bat » suc bat, luc nhat, luat bat
va nhan » van nhan, ca nhan, va phan
sach ky » sac ky, sach y, sach kem
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach ty)) nang xa hoi. lieu va nhan luc bat hanh vi ((va triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang xa hoi. lieu va nhan luc bat hanh vi ((va triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) nang xa hoi. lieu va nhan luc bat hanh vi ((va triet) or (su viet))*.