Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham luc » cham soc, nhan luc, cham cuu
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
thai va » thai van
y nang » ky nang, ly nang, v nang
va han » va phan, van han, va hang
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: thu sach y nang xa hoi. hieu van cham luc ((va han) OR (va hanh)) thai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu van cham luc ((va han) OR (va hanh)) thai va thiet".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu van cham luc ((va han) OR (va hanh)) thai va thiet*.