Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
van han » van hanh, van phan, van nhan
thai va » thai van
tai va » mai va, tri va, dai 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: ((so sach) OR (co sach)) ky nang xa hoi. hieu va cham luc van han ((tai va) or (thai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang xa hoi. hieu va cham luc van han ((tai va) OR (thai va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ky nang xa hoi. hieu va cham luc van han ((tai va) or (thai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ky nang xa hoi. hieu va cham luc van han ((tai va) or (thai va)) thiet*.