Perhaps you should try some spelling variations:
van trinh » van thinh, van tinh, dan trinh
va trinh » va tinh, lap trinh, qua trinh
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » ha nam, va nay
vu cua » hu cua, tu cua

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

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