Perhaps you should try some spelling variations:
xang cho » sang cho, hang cho, tang cho
ban hanh » ban hang
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cho hoc » co hoc, khoa hoc
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty xang cho hoc. hieu ve ((cac vuc) or (dat nuoc)) ban hanh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang cho hoc. hieu ve ((cac vuc) OR (dat nuoc)) ban hanh vi cua cac*.