Perhaps you should try some spelling variations:
duoc ban » duc ban, quoc ban, buoc ban
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve tao » ve bao, de tao, ve tac
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu ve tao duoc ban hanh vi ((cua viet) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ve tao duoc ban hanh vi ((cua viet) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ve tao duoc ban hanh vi ((cua viet) or (cua tu))*.