Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
nano cho » nang cho, nano cuo, nang chon
cua cau » cua cac, cua cay, cua can
va hanh » van hanh, va thanh, ban hanh
van cac » van hac, van cau, van bac
cho hoc » co hoc, khoa hoc
tu nano » truc nano
cua chu » sua chua
du va » dau va, tu va, su va

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) OR (toc sach)) tu nano cho hoc. hieu van cac du va hanh vi ((cua cau) or (cua chu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu nano cho hoc. hieu van cac du va hanh vi ((cua cau) OR (cua chu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu nano cho hoc. hieu van cac du va hanh vi ((cua cau) or (cua chu))*".