Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham tuc » tham thuc, thai tuc, nham thuc
sinh dai » sinh thai, si dai, sinh vat
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang ma » mang may, tang van
va tham » van tham, va cham, va thanh
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: toc sach ty tang ma hoi. lieu va tham tuc xa ((sinh dai) or (dinh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty tang ma hoi. lieu va tham tuc xa ((sinh dai) OR (dinh van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty tang ma hoi. lieu va tham tuc xa ((sinh dai) or (dinh van)) cua tre*.