Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, nam thu, nam tu
thanh do » thanh de, thanh hoa, thanh loi
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
xay hoi » xa hoi, tay hoi, cay phoi
cua te » cua tu

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 dang xay hoi. hieu van ((nam thuc) or (am thuc)) day ((thanh do) or (thanh pho)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty dang xay hoi. hieu van ((nam thuc) OR (am thuc)) day ((thanh do) OR (thanh pho)) cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ty dang xay hoi. hieu van ((nam thuc) or (am thuc)) day ((thanh do) or (thanh pho)) cua te*.