Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
vu sach » vu bach, su sach
van dau » van dao, phan dau
tich ca » tich cac, tich can, tich cau
va tich » va tinh, va dich
van cau » van hau, van chat, toan cau
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (vu khach)) ky nang xa hoi. hieu ((van cau) OR (van dau)) luc va tich ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang xa hoi. hieu ((van cau) OR (van dau)) luc va tich ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky nang xa hoi. hieu ((van cau) OR (van dau)) luc va tich ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang xa hoi. hieu ((van cau) OR (van dau)) luc va tich ca cua tre*.