Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
thuc ban » thuoc ban, thu ban, thuc van
hanh vai » hanh vi, hanh va, hanh tai
thuc dan » thuc hanh, hoc dan, thuc vat
nang xa » nang x, lang xa, nang ma
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khanh) or (te sach)) ky nang xa hoi. lieu va cam ((thuc ban) OR (thuc dan)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khanh) OR (te sach)) ky nang xa hoi. lieu va cam ((thuc ban) OR (thuc dan)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khanh) or (te sach)) ky nang xa hoi. lieu va cam ((thuc ban) OR (thuc dan)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khanh) or (te sach)) ky nang xa hoi. lieu va cam ((thuc ban) OR (thuc dan)) hanh vai cua tre*.