Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
xang cho » sang cho, hang cho, tang cho
sach thu » sach thieu, sach tham, cach thuc
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
cua cau » cua cac, cua chu, cua cay
cho hoc » co hoc, khoa hoc
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: te ((sach thu) or (sach thue)) xang cho hoc. hieu ve cac luc ((van hanh) OR (ban hanh)) vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach thue)) xang cho hoc. hieu ve cac luc ((van hanh) OR (ban hanh)) vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach thue)) xang cho hoc. hieu ve cac luc ((van hanh) OR (ban hanh)) vi cua cau*".