Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
chat xuc » chat huu, cam xuc, chao xu
mang dai » lang dai, mang dat, mang dau
ky mang » ky nang, ke mang, ky dang
dai hoi » dai hoc, dai hai, dai moi
hieu su » tieu su, hieu so, hieu suat
va hanh » van hanh, va thanh, va danh
tu bai » tu ban, tu bat, te bai
xuc va » duc va, tuc va, luc va
bai ky » ban ky, sai ky, bac ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky mang dai hoi. ((hieu su) or (hieu sau)) chat xuc va hanh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky mang dai hoi. ((hieu su) OR (hieu sau)) chat xuc va hanh vi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky mang dai hoi. ((hieu su) or (hieu sau)) chat xuc va hanh vi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu bai ky mang dai hoi. ((hieu su) or (hieu sau)) chat xuc va hanh vi ((cua te) OR (cua tu))*.