Perhaps you should try some spelling variations:
qua phan » cua phan, qua than, quang phan
phan luc » nhan luc, phan duc, phan suc
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
thu ban » thu hang
luc van » luoc van, luu van, duc van
su viet » so viet
ban ky » van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ban ky nang x ho. hieu qua phan luc van hanh vi ((va triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ban ky nang x ho. hieu qua phan luc van hanh vi ((va triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: thu ban ky nang x ho. hieu qua phan luc van hanh vi ((va triet) or (su viet))*.