Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
dau cua » dai cua, day cua, cau cua
cua cua » cua chua, ca cua, qua cua
tu sach » thu sach, tu cach, vu sach
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
va dau » va dao

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) OR (su sach))) or (te sach)) y nang xa hoi. hieu vu cham luc va dau cua cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (te sach)) y nang xa hoi. hieu vu cham luc va dau cua cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (te sach)) y nang xa hoi. hieu vu cham luc va dau cua cua viet*".