Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hoc duoc » hoc nuoc, hoa duoc, hoc dung
duoc ban » duc ban, quoc ban, buoc ban
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
sach ty » sach y, sach tu, sach thu
xang ma » nang ma, sang ma, rang ma
tang ma » mang may, tang van
van hoc » van hoa
vai cua » dai cua, hai cua, lai cua
cua tu » cua tuc, cua su, cua cu

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 ((xang ma) or (tang ma)) hoi. hieu van hoc duoc ban hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((xang ma) OR (tang ma)) hoi. hieu van hoc duoc ban hanh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((xang ma) or (tang ma)) hoi. hieu van hoc duoc ban hanh vai cua tu*.