Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
luc van » luoc van, luu van, duc van
hieu ve » hieu va
cho hoc » co hoc, khoa hoc
ty hang » ly hang, thi hang, thu hang
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 hang) OR (ty xang)) cho hoc. ((hieu ve) or (hieu van)) coc luc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (ty xang)) cho hoc. ((hieu ve) OR (hieu van)) coc luc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty hang) OR (ty xang)) cho hoc. ((hieu ve) or (hieu van)) coc luc van hanh vi cua cau*".