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
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
xuc va » duc va, tuc va, xac va

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 ma hoi. thieu nien cac ((((xuc va) OR (luc 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 ma hoi. thieu nien cac ((((xuc va) OR (luc 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 ma hoi. thieu nien cac ((((xuc va) OR (luc va))) or (thuc va)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. thieu nien cac ((((xuc va) OR (luc va))) or (thuc va)) hanh vi cua viet*.