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
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ty xang, ty hang, ly nang
tu sach » thu sach, su sach, te sach
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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 (ky nang)) mai hoi. thieu nien cac ((xuc va) or (tuc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) mai hoi. thieu nien cac ((xuc va) OR (tuc va)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) mai hoi. thieu nien cac ((xuc va) or (tuc va)) hanh vi cua viet*.