Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ly nang, ty nong
ty hang » ly hang, ty xang, thi hang
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((((ty nang) OR (ky nang))) or (ty hang)) xa hoi. hieu vu cham luc va dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((ty nang) OR (ky nang))) OR (ty hang)) xa hoi. hieu vu cham luc va dan va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((((ty nang) OR (ky nang))) or (ty hang)) xa hoi. hieu vu cham luc va dan va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((((ty nang) OR (ky nang))) or (ty hang)) xa hoi. hieu vu cham luc va dan va cuu tre*.