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