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
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o 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 o 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 o hoi. hieu va phat luc van hanh vi ((va trien) or (su triet))*.