Perhaps you should try some spelling variations:
thieu nien » thien nhien
dinh viet » ninh viet, danh viet, trinh viet
viet cua » viec cua, viet ca, viet qua
toc sach » hoc sach, doc sach, thuoc sach
cac ban » cac dan, can ban, cac bai
va dinh » van dinh, va kinh, va tinh
cac van » cac dan
xang ma » tang ma, nang ma, sang ma
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ty xang ma hoi. thieu nien ((cac ban) OR (cac van)) va dinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty xang ma hoi. thieu nien ((cac ban) OR (cac van)) va dinh viet cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty xang ma hoi. thieu nien ((cac ban) OR (cac van)) va dinh viet cua tre*".