Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
sach thi » sach thu, sach thieu, sach tham
sach tai » sach bai, sach tham, sach dao
hieu van » hieu va, thien van, lieu va
hang ca » hang va, nang cao, hang tai
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
dai hoa » dai khoa, dai hoc, dai hoi
ca hoi » cau hoi, cua hoi, xa 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 thi) or (sach tai)) hang ca hoi. hieu van cac xuc ban thanh dai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach tai)) hang ca hoi. hieu van cac xuc ban thanh dai hoa viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach tai)) hang ca hoi. hieu van cac xuc ban thanh dai hoa viet*.