Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
hang vi » hang va, hanh vi, hang di
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du
tu van » tu va
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: so sach y nang x hoi. hieu va cac tu van ((hang doi) or (hang vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang x hoi. hieu va cac tu van ((hang doi) OR (hang vi)) cua viet*.