Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » vu sach
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
dau tuc » dao tuc, cau truc, dau nuoc
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ty nang xa hoi. lieu va ((dau tuc) OR (dau tu)) van hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang xa hoi. lieu va ((dau tuc) OR (dau tu)) van hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ty nang xa hoi. lieu va ((dau tuc) OR (dau tu)) van hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ty nang xa hoi. lieu va ((dau tuc) OR (dau tu)) van hanh di cuu tre*.