Perhaps you should try some spelling variations:
van trinh » van thinh, van tinh, dan trinh
hieu cai » hieu cac, hieu chi, hieu ca
va trinh » va tinh, lap trinh, qua trinh
cai nam » hai nam, mai nam, chi nam
nam qua » nam quan, nam cua, nam mua
cua tre » cuu tre, cua triet, dua tren
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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