Perhaps you should try some spelling variations:
phat luc » nhan luc, phat huy, chat lua
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
sac ky » sai ky
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 ((sac ky) OR (cac ky)) nang x hoi. hieu va phat luc van hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang x hoi. hieu va phat luc van hanh vi ((va trien) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (cac ky)) nang x hoi. hieu va phat luc van hanh vi ((va trien) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (cac ky)) nang x hoi. hieu va phat luc van hanh vi ((va trien) or (su triet))*.