Perhaps you should try some spelling variations:
van thinh » van thanh, van chinh, van minh
nam qua » nam quan, nam cua, nam xua
nam mua » nam cua, nam xua, nam luat
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu qua ((nam qua) OR (nam mua)) ((lap trinh) OR (van thinh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu qua ((nam qua) OR (nam mua)) ((lap trinh) or (van thinh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu qua ((nam qua) OR (nam mua)) ((lap trinh) or (van thinh)) vi cua tre*.