Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
chon hoc » cho hoc, chon loc, chung hoc
hieu va » lieu va, hieu qua
cac xuc » cam xuc, chat xuc, cac cuoc
te sach » toc sach
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
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 ((tu nang) OR (tu nano)) chon hoc. hieu va ((cac xuc) or (cac nuoc)) van hanh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nano)) chon hoc. hieu va ((cac xuc) OR (cac nuoc)) van hanh vi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nano)) chon hoc. hieu va ((cac xuc) or (cac nuoc)) van hanh vi cua cac*".