Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nhan luc » nang luc
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang ho » nang hoc, nang co, tang ho
va nhan » van nhan, ca nhan, va phan
nang o » nang co, nang ro, nang x

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 o) or (nang ho)) hoi. hieu va nhan luc van hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang o) OR (nang ho)) hoi. hieu va nhan luc van hanh vi ((va trien) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang o) or (nang ho)) hoi. hieu va nhan luc van hanh vi ((va trien) or (su triet))*.