Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
cua nhan » ca nhan, cua ngan, cua nha
nhan luc » nang luc
van hanh » van thanh, ban hanh, van ban
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang ma » tang ma, sang ma, nang cao
van anh » van thanh, tuan anh, van minh
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach vu nang ma hoa. hieu cua nhan luc ((van hanh) or (van anh)) ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang ma hoa. hieu cua nhan luc ((van hanh) OR (van anh)) ve su triet.
• Adding a wildcard symbol may retrieve word variants: su sach vu nang ma hoa. hieu cua nhan luc ((van hanh) or (van anh)) ve su triet*.