Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien bach » vien bach, dien sach, mien bac
bach xuc » bach tuoc, bach xuan, bach hue
toc sach » hoc sach, doc sach, thuoc sach
sang mai » sang ma, sang tai, lang mai
va thanh » gia thanh, ban thanh, le thanh
va tinh » may tinh
hoc cac » hoc cao
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc cac) or (toc sach)) ky sang mai hoi. thieu nien bach xuc ((va thanh) OR (va tinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc cac) OR (toc sach)) ky sang mai hoi. thieu nien bach xuc ((va thanh) OR (va tinh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc cac) or (toc sach)) ky sang mai hoi. thieu nien bach xuc ((va thanh) OR (va tinh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc cac) or (toc sach)) ky sang mai hoi. thieu nien bach xuc ((va thanh) OR (va tinh)) di cua tre*.