Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua viet » ca viet, hoa viet, cua vat
nien cac » vien cac, dien cac, bien cac
ty nang » ky nang, ty hang, ly nang
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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 ((ty nang) OR (ty xang)) ma hoi. thieu nien cac ((xuc va) or (thuc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) ma hoi. thieu nien cac ((xuc va) OR (thuc va)) hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) ma hoi. thieu nien cac ((xuc va) or (thuc va)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) ma hoi. thieu nien cac ((xuc va) or (thuc va)) hanh vi cua viet*.