Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cau duc » cao duc, cau luc, cau truc
chu duc » thu duc, chua duoc, cuu duoc
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van ((cau duc) OR (chu duc)) van hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu van ((cau duc) OR (chu duc)) van hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu van ((cau duc) OR (chu duc)) van hanh va cua tre*.