Perhaps you should try some spelling variations:
khoa hoc » hoa hoc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cua chu » sua chua
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 tang ((((cho hoc) OR (khoa hoc))) or (co hoc)). hieu va cac xuc van hanh vi cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty tang ((((cho hoc) OR (khoa hoc))) OR (co hoc)). hieu va cac xuc van hanh vi cua chu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty tang ((((cho hoc) OR (khoa hoc))) or (co hoc)). hieu va cac xuc van hanh vi cua chu*".