Perhaps you should try some spelling variations:
hieu sau » hieu su, hieu suat, tieu su
sau chao » sau cho, sau chan, cau cham
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
sang ky » sang kyo, dang ky, tang ky
tu sang » thu sang, tu san, tu lang
dai hoi » dai hoc, dai hai, dai moi
lai hoi » lai hoa, lai roi, mai hoi
ky sang » ky nang, ky dang, ky tang
cua tu » cua tuc, cua su, cua cu
xu va » xu van, tu va, su 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 sang ky sang ((lai hoi) or (dai hoi)). hieu sau chao xu va danh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang ky sang ((lai hoi) OR (dai hoi)). hieu sau chao xu va danh vi ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sang ky sang ((lai hoi) or (dai hoi)). hieu sau chao xu va danh vi ((cua te) OR (cua tu))*".