Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
nuoc van » nuoc va, nuoc san, luoc van
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
van hoc » van hoa
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang

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 ((y nang) or (van nang)) xa hoi. hieu van hoc nuoc van hanh di ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (van nang)) xa hoi. hieu van hoc nuoc van hanh di ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (van nang)) xa hoi. hieu van hoc nuoc van hanh di ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (van nang)) xa hoi. hieu van hoc nuoc van hanh di ((cua tre) OR (cuu tre))*.