Perhaps you should try some spelling variations:
thieu nien » thien nhien
hanh thai » nhanh thai, hinh thai, hanh tai
cac thuc » cach thuc, cac thu, can thuc
thai cua » than cua, tai cuc, tri cua
thu sach » thuat sach, thuoc sach, thu hoach
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
nien cac » vien cac, dien cac, bien cac
tu sach » su sach, te sach, tu cach
ky tang » ky nang, ky dang, kho tang
cua te » cua tu
ma hoi » mai hoi, ma hoa, me hoi

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) or (thu sach)) ky tang ((ma hoi) OR (xa hoi)). thieu nien cac thuc ban hanh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang ((ma hoi) OR (xa hoi)). thieu nien cac thuc ban hanh thai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky tang ((ma hoi) OR (xa hoi)). thieu nien cac thuc ban hanh thai cua te*".