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