Perhaps you should try some spelling variations:
bat tinh » ban tinh, sat tinh, bac tinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
luc bat » suc bat, luc nhat, luat bat
va chu » va che
va chi » van chi, va che, va cai
va cau » van cau, va dau, va cao

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 va cac luc bat tinh ((((va chu) or (va chi))) or (va cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va cac luc bat tinh ((((va chu) OR (va chi))) OR (va cau)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va cac luc bat tinh ((((va chu) or (va chi))) or (va cau)) tre*.