Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham luc » cham soc, nhan luc, cham cuu
sach ky » sac ky, sach y, sach ty
cau cua » cau qua, ca cua, cu cua
dau cua » dai cua, day cua, dan cua
tu sach » thu sach, su sach, te sach
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va

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