Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
tan thanh » tran thanh, tang thanh, toan thanh
thu sach » tu sach, thuat sach, thuoc sach
hieu voi » hieu moi, lieu voi, hieu loi
voi pham » vi pham, toi pham, loai pham
so sach » so sanh, bo sach, co sach
loi cua » loai cua, hoi cua, doi cua
cua te » cua tu
o hoc » mo hoc, so hoc, y hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (so sach)) ky nang ((o hoc) OR (co hoc)). hieu voi pham duc tan thanh loi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (so sach)) ky nang ((o hoc) OR (co hoc)). hieu voi pham duc tan thanh loi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (so sach)) ky nang ((o hoc) OR (co hoc)). hieu voi pham duc tan thanh loi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (so sach)) ky nang ((o hoc) OR (co hoc)). hieu voi pham duc tan thanh loi cua te*.