Perhaps you should try some spelling variations:
ky sang » ky dang, ky tang, duy sang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » hieu sau, tieu su, hieu so
su chao » su cao, sau chan
chao su » cao su, chao xu, achat su
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
cua tu » cua tuc, cua su, cua cu
su va » su van, tu va

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