Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bat tinh » ban tinh, sat tinh, bac tinh
vien cac » vien bach, vien dai, vien da
luc bat » suc bat, luc nhat, luat bat
tu sach » thu sach, su sach, te sach
cac luc » cau luc, coc luc, cac nuoc
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va chu » va che
va chi » van chi, va che, va cai
va cau » van cau, va cac, va dau

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 y nang xa hoi. hieu vien 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 y nang xa hoi. hieu vien cac luc bat tinh ((((va chu) OR (va chi))) OR (va cau)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu vien cac luc bat tinh ((((va chu) or (va chi))) or (va cau)) tre*.