Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
van cau » van dau, van hau, van chat
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua
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: ((tu sach) or (su sach)) ky nang x hoi. hieu van cau ((luc va) OR (tuc va)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu van cau ((luc va) OR (tuc va)) hanh di cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. hieu van cau ((luc va) OR (tuc va)) hanh di cua viet*".