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