Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
xang cho » sang cho, hang cho, tang cho
ban hanh » ban hang
cho hoc » co hoc, khoa hoc
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc ban » vu ban, duc ban, cuc ban
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
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: ((toc sach) or (doc sach)) ty xang cho hoc. hieu ve cac vuc ban hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty xang cho hoc. hieu ve cac vuc ban hanh vi cua cau*.