Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
te sach » toc sach
xuc ban » duc ban, cuc ban, quoc ban
cac xuc » cam xuc, cac nuoc, chat xuc
cua cau » cua cac, cua chu, cua cay
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va
cho hoc » khoa hoc
tu ngan » vu ngan, tu ngay, te ngan
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 tu ngan ((cho hoc) OR (co hoc)). ((hieu ve) or (hieu van)) cac xuc ban hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ngan ((cho hoc) OR (co hoc)). ((hieu ve) OR (hieu van)) cac xuc ban hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ngan ((cho hoc) OR (co hoc)). ((hieu ve) or (hieu van)) cac xuc ban hanh vi cua cau*".