Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dan thuc » dan toc, am thuc
dau thuc » dai thuc, dam thuc, day thuc
su sach » so sach
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
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 (vu sach)) ty nang xa hoi. lieu va ((dau thuc) OR (dan thuc)) van hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty nang xa hoi. lieu va ((dau thuc) OR (dan thuc)) van hanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ty nang xa hoi. lieu va ((dau thuc) OR (dan thuc)) van hanh di cuu tre*".