Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang doi » hang di, hang loi, huong doi
cua viet » ca viet, hoa viet, cua vat
hieu vi » hieu voi, hieu va, hieu ve
hanh di » hanh vi, hanh de, hang di
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
pham » phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu vi pham duc va ((hanh di) or (hang doi)) ((cu tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu vi pham duc va ((hanh di) OR (hang doi)) ((cu tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu vi pham duc va ((hanh di) or (hang doi)) ((cu tren) or (cua viet))*.