Perhaps you should try some spelling variations:
tay long » ta long, tac long, tay cong
sach tay » xach tay, sach hay, sach nay
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
che hoc » cho hoc, che ho, che thuoc
hoa hoi » khoa hoi, hoa doi, hoc hoi
hanh di » hanh vi, hanh de, hang di
hieu ke » hieu kem, chieu ke, hieu ve
hoc van » hoc dan, hoc va, hoc vat
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tay long ((hoa hoi) OR (hoa hoc)). ((hieu ke) OR (hieu ky)) che hoc van hanh di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tay long ((hoa hoi) or (hoa hoc)). ((hieu ke) OR (hieu ky)) che hoc van hanh di cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach tay long ((hoa hoi) or (hoa hoc)). ((hieu ke) OR (hieu ky)) che hoc van hanh di cua te*.