Perhaps you should try some spelling variations:
hieu suat » hieu qua
hieu luat » hieu qua
sang tai » hang tai, sang tao, tang tai
hanh vai » hanh vi, hanh va, hanh tai
ky sang » ky nang, ky dang, ky tang
tai hoi » tai khoi, dai hoi, tai hai
vai cua » dai cua, hai cua, lai cua
luc va » duc va, tuc va, loc va
tu san » thu san, tu ban, tu can
xuc va » duc va, tuc va, xac va
san ky » sang ky, van ky, dan ky
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 ky sang tai hoi. ((hieu suat) OR (hieu luat)) chat ((xuc va) or (luc va)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky sang tai hoi. ((hieu suat) OR (hieu luat)) chat ((xuc va) OR (luc va)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky sang tai hoi. ((hieu suat) OR (hieu luat)) chat ((xuc va) or (luc va)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ky sang tai hoi. ((hieu suat) OR (hieu luat)) chat ((xuc va) or (luc va)) hanh vai cua te*.