Perhaps you should try some spelling variations:
nano chon » nang chon, nam chon, nang cho
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
chon hoc » cho hoc, chon loc, chung hoc
cac xuc » cam xuc, cac nuoc, chat xuc
cua cau » cua cac, cua chu, cua can
xuc van » duc van, luc van, vuc van
van cac » van hac, van cau, van bac
ty nano » tu nano, day nano, tao nano
cua cay » cua cac

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