Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
bat hanh » bat khanh, ban hanh, bao hanh
va triet » va trien, ve triet, cua triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
luc bat » suc bat, luc nhat, luat bat
su viet » so viet
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu van nhan luc bat hanh vi ((((va triet) OR (va thiet))) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van nhan luc bat hanh vi ((((va triet) OR (va thiet))) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu van nhan luc bat hanh vi ((((va triet) OR (va thiet))) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van nhan luc bat hanh vi ((((va triet) OR (va thiet))) or (su viet))*.