Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
sua va » suat va, vua va, xua va
thiet » thieu

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 y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc ((va hanh) or (van hanh)) sua va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc ((va hanh) OR (van hanh)) sua va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc ((va hanh) or (van hanh)) sua va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc ((va hanh) or (van hanh)) sua va thiet*.