Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham luc » cham soc, nhan luc, cham cuu
luc van » luoc van, luu van, duc van
hieu vu » hieu va, hieu ve, hieu su
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
vu cham » va cham, vu kham, tu cham
y nang » ky nang, ly nang, v nang
vi su » va su, ki su, oi su
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) or (te sach)) y nang xa hoi. hieu vu cham luc van hanh ((vi su) OR (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) y nang xa hoi. hieu vu cham luc van hanh ((vi su) OR (ve su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) y nang xa hoi. hieu vu cham luc van hanh ((vi su) OR (ve su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) y nang xa hoi. hieu vu cham luc van hanh ((vi su) OR (ve su)) triet*.