Perhaps you should try some spelling variations:
dat duoc » dat nuoc, da duoc, luat duoc
duoc ban » duc ban, quoc ban, buoc ban
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
qua dat » quy dat, qua da, qua dan
vai cua » dai cua, hai cua, lai cua
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (cac ky)) nang ((x hoi) OR (xa hoi)). hieu qua dat duoc ban hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (cac ky)) nang ((x hoi) OR (xa hoi)). hieu qua dat duoc ban hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (cac ky)) nang ((x hoi) OR (xa hoi)). hieu qua dat duoc ban hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) nang ((x hoi) OR (xa hoi)). hieu qua dat duoc ban hanh vai cua te*.