Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
truc ban » thuc ban, truc dan, truc van
tuc ban » thuc ban, tu ban, tuc dan
va cham » va chat, va tham
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v tang » 6 tang, 7 tang, 5 tang
vi cua » vai cua, di cua

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 v tang ((mai hoi) or (lai hoi)). hieu va cham ((tuc ban) OR (truc ban)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v tang ((mai hoi) OR (lai hoi)). hieu va cham ((tuc ban) OR (truc ban)) hanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v tang ((mai hoi) or (lai hoi)). hieu va cham ((tuc ban) OR (truc ban)) hanh vi cua viet*".