Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
cham cuu » cap cuu, chat cua
va khanh » va thanh, vu khanh, va hanh
te sach » toc sach
tu cham » toc cham, thi cham
hieu tu » chieu tu, hieu tuc, hien tu
dai hoi » dai hoc, dai hai, dai moi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ly cua » le cua

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