Perhaps you should try some spelling variations:
sang than » cang thang, dang thanh, ban than
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
sang tai » hang tai, tang tai, dung tai
sang tao » hang tai
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao

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 van nang cao hoi. lieu va cao duc va ((((sang tai) or (sang than))) or (sang tao)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach van nang cao hoi. lieu va cao duc va ((((sang tai) OR (sang than))) OR (sang tao)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach van nang cao hoi. lieu va cao duc va ((((sang tai) or (sang than))) or (sang tao)) cuu tre*.