Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
chat huu » pham huu
hieu vu » hieu va, hieu ve, hieu su
va hanh » van hanh, va thanh, va danh
ky sang » ky nang, ky dang, ky tang
dai hoi » dai hoc, dai hai, dai moi
vi cua » vai cua, di cua
huu va » cuu va, tuu va
tu san » thu san, tu can, vu san
tu ban » thu ban, te ban
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) or (tu ban)) ky sang dai hoi. ((hieu vu) or (hieu qua)) chat huu va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu ban)) ky sang dai hoi. ((hieu vu) OR (hieu qua)) chat huu va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky sang dai hoi. ((hieu vu) or (hieu qua)) chat huu va hanh vi cua te*.