Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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