Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
toc sach » hoc sach, doc sach, thuoc sach
bien cac » vien cac, dien cac, bien ca
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thieu bien cac ((xuc va) or (luc va)) hanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thieu bien cac ((xuc va) OR (luc va)) hanh va cua viet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thieu bien cac ((xuc va) or (luc va)) hanh va cua viet*.